WordPress/wp-includes/functions.php

<?php
/**
 * Main WordPress API
 *
 * @package WordPress
 */

/**
 * Converts MySQL DATETIME field to user specified date format.
 *
 * If $dateformatstring has 'G' value, then gmmktime() function will be used to
 * make the time. If $dateformatstring is set to 'U', then mktime() function
 * will be used to make the time.
 *
 * The $translate will only be used, if it is set to true and it is by default
 * and if the $wp_locale object has the month and weekday set.
 *
 * @since 0.71
 *
 * @param string $dateformatstring Either 'G', 'U', or php date format.
 * @param string $mysqlstring Time from mysql DATETIME field.
 * @param bool $translate Optional. Default is true. Will switch format to locale.
 * @return string Date formated by $dateformatstring or locale (if available).
 */
function mysql2date( $dateformatstring, $mysqlstring, $translate = true ) {
	global $wp_locale;
	$m = $mysqlstring;
	if ( empty( $m ) )
		return false;

	if( 'G' == $dateformatstring ) {
		return strtotime( $m . ' +0000' );
	}

	$i = strtotime( $m );

	if( 'U' == $dateformatstring )
		return $i;

	if ( $translate)
	    return date_i18n( $dateformatstring, $i );
	else
	    return date( $dateformatstring, $i );
}

/**
 * Retrieve the current time based on specified type.
 *
 * The 'mysql' type will return the time in the format for MySQL DATETIME field.
 * The 'timestamp' type will return the current timestamp.
 *
 * If $gmt is set to either '1' or 'true', then both types will use GMT time.
 * if $gmt is false, the output is adjusted with the GMT offset in the WordPress option.
 *
 * @since 1.0.0
 *
 * @param string $type Either 'mysql' or 'timestamp'.
 * @param int|bool $gmt Optional. Whether to use GMT timezone. Default is false.
 * @return int|string String if $type is 'gmt', int if $type is 'timestamp'.
 */
function current_time( $type, $gmt = 0 ) {
	switch ( $type ) {
		case 'mysql':
			return ( $gmt ) ? gmdate( 'Y-m-d H:i:s' ) : gmdate( 'Y-m-d H:i:s', ( time() + ( get_option( 'gmt_offset' ) * 3600 ) ) );
			break;
		case 'timestamp':
			return ( $gmt ) ? time() : time() + ( get_option( 'gmt_offset' ) * 3600 );
			break;
	}
}

/**
 * Retrieve the date in localized format, based on timestamp.
 *
 * If the locale specifies the locale month and weekday, then the locale will
 * take over the format for the date. If it isn't, then the date format string
 * will be used instead.
 *
 * @since 0.71
 *
 * @param string $dateformatstring Format to display the date.
 * @param int $unixtimestamp Optional. Unix timestamp.
 * @param bool $gmt Optional, default is false. Whether to convert to GMT for time.
 * @return string The date, translated if locale specifies it.
 */
function date_i18n( $dateformatstring, $unixtimestamp = false, $gmt = false ) {
	global $wp_locale;
	$i = $unixtimestamp;
	// Sanity check for PHP 5.1.0-
	if ( false === $i || intval($i) < 0 ) {
		if ( ! $gmt )
			$i = current_time( 'timestamp' );
		else
			$i = time();
		// we should not let date() interfere with our
		// specially computed timestamp
		$gmt = true;
	}

	// store original value for language with untypical grammars
	// see http://core.trac.wordpress.org/ticket/9396
	$req_format = $dateformatstring;

	$datefunc = $gmt? 'gmdate' : 'date';

	if ( ( !empty( $wp_locale->month ) ) && ( !empty( $wp_locale->weekday ) ) ) {
		$datemonth = $wp_locale->get_month( $datefunc( 'm', $i ) );
		$datemonth_abbrev = $wp_locale->get_month_abbrev( $datemonth );
		$dateweekday = $wp_locale->get_weekday( $datefunc( 'w', $i ) );
		$dateweekday_abbrev = $wp_locale->get_weekday_abbrev( $dateweekday );
		$datemeridiem = $wp_locale->get_meridiem( $datefunc( 'a', $i ) );
		$datemeridiem_capital = $wp_locale->get_meridiem( $datefunc( 'A', $i ) );
		$dateformatstring = ' '.$dateformatstring;
		$dateformatstring = preg_replace( "/([^\\\])D/", "\\1" . backslashit( $dateweekday_abbrev ), $dateformatstring );
		$dateformatstring = preg_replace( "/([^\\\])F/", "\\1" . backslashit( $datemonth ), $dateformatstring );
		$dateformatstring = preg_replace( "/([^\\\])l/", "\\1" . backslashit( $dateweekday ), $dateformatstring );
		$dateformatstring = preg_replace( "/([^\\\])M/", "\\1" . backslashit( $datemonth_abbrev ), $dateformatstring );
		$dateformatstring = preg_replace( "/([^\\\])a/", "\\1" . backslashit( $datemeridiem ), $dateformatstring );
		$dateformatstring = preg_replace( "/([^\\\])A/", "\\1" . backslashit( $datemeridiem_capital ), $dateformatstring );

		$dateformatstring = substr( $dateformatstring, 1, strlen( $dateformatstring ) -1 );
	}
	$j = @$datefunc( $dateformatstring, $i );
	// allow plugins to redo this entirely for languages with untypical grammars
	$j = apply_filters('date_i18n', $j, $req_format, $unixtimestamp, $gmt);
	return $j;
}

/**
 * Convert number to format based on the locale.
 *
 * @since 2.3.0
 *
 * @param mixed $number The number to convert based on locale.
 * @param int $decimals Precision of the number of decimal places.
 * @return string Converted number in string format.
 */
function number_format_i18n( $number, $decimals = null ) {
	global $wp_locale;
	// let the user override the precision only
	$decimals = ( is_null( $decimals ) ) ? $wp_locale->number_format['decimals'] : intval( $decimals );

	return number_format( $number, $decimals, $wp_locale->number_format['decimal_point'], $wp_locale->number_format['thousands_sep'] );
}

/**
 * Convert number of bytes largest unit bytes will fit into.
 *
 * It is easier to read 1kB than 1024 bytes and 1MB than 1048576 bytes. Converts
 * number of bytes to human readable number by taking the number of that unit
 * that the bytes will go into it. Supports TB value.
 *
 * Please note that integers in PHP are limited to 32 bits, unless they are on
 * 64 bit architecture, then they have 64 bit size. If you need to place the
 * larger size then what PHP integer type will hold, then use a string. It will
 * be converted to a double, which should always have 64 bit length.
 *
 * Technically the correct unit names for powers of 1024 are KiB, MiB etc.
 * @link http://en.wikipedia.org/wiki/Byte
 *
 * @since 2.3.0
 *
 * @param int|string $bytes Number of bytes. Note max integer size for integers.
 * @param int $decimals Precision of number of decimal places.
 * @return bool|string False on failure. Number string on success.
 */
function size_format( $bytes, $decimals = null ) {
	$quant = array(
		// ========================= Origin ====
		'TB' => 1099511627776,  // pow( 1024, 4)
		'GB' => 1073741824,     // pow( 1024, 3)
		'MB' => 1048576,        // pow( 1024, 2)
		'kB' => 1024,           // pow( 1024, 1)
		'B ' => 1,              // pow( 1024, 0)
	);

	foreach ( $quant as $unit => $mag )
		if ( doubleval($bytes) >= $mag )
			return number_format_i18n( $bytes / $mag, $decimals ) . ' ' . $unit;

	return false;
}

/**
 * Get the week start and end from the datetime or date string from mysql.
 *
 * @since 0.71
 *
 * @param string $mysqlstring Date or datetime field type from mysql.
 * @param int $start_of_week Optional. Start of the week as an integer.
 * @return array Keys are 'start' and 'end'.
 */
function get_weekstartend( $mysqlstring, $start_of_week = '' ) {
	$my = substr( $mysqlstring, 0, 4 ); // Mysql string Year
	$mm = substr( $mysqlstring, 8, 2 ); // Mysql string Month
	$md = substr( $mysqlstring, 5, 2 ); // Mysql string day
	$day = mktime( 0, 0, 0, $md, $mm, $my ); // The timestamp for mysqlstring day.
	$weekday = date( 'w', $day ); // The day of the week from the timestamp
	$i = 86400; // One day
	if( !is_numeric($start_of_week) )
		$start_of_week = get_option( 'start_of_week' );

	if ( $weekday < $start_of_week )
		$weekday = 7 - $start_of_week - $weekday;

	while ( $weekday > $start_of_week ) {
		$weekday = date( 'w', $day );
		if ( $weekday < $start_of_week )
			$weekday = 7 - $start_of_week - $weekday;

		$day -= 86400;
		$i = 0;
	}
	$week['start'] = $day + 86400 - $i;
	$week['end'] = $week['start'] + 604799;
	return $week;
}

/**
 * Unserialize value only if it was serialized.
 *
 * @since 2.0.0
 *
 * @param string $original Maybe unserialized original, if is needed.
 * @return mixed Unserialized data can be any type.
 */
function maybe_unserialize( $original ) {
	if ( is_serialized( $original ) ) // don't attempt to unserialize data that wasn't serialized going in
		return @unserialize( $original );
	return $original;
}

/**
 * Check value to find if it was serialized.
 *
 * If $data is not an string, then returned value will always be false.
 * Serialized data is always a string.
 *
 * @since 2.0.5
 *
 * @param mixed $data Value to check to see if was serialized.
 * @return bool False if not serialized and true if it was.
 */
function is_serialized( $data ) {
	// if it isn't a string, it isn't serialized
	if ( !is_string( $data ) )
		return false;
	$data = trim( $data );
	if ( 'N;' == $data )
		return true;
	if ( !preg_match( '/^([adObis]):/', $data, $badions ) )
		return false;
	switch ( $badions[1] ) {
		case 'a' :
		case 'O' :
		case 's' :
			if ( preg_match( "/^{$badions[1]}:[0-9]+:.*[;}]\$/s", $data ) )
				return true;
			break;
		case 'b' :
		case 'i' :
		case 'd' :
			if ( preg_match( "/^{$badions[1]}:[0-9.E-]+;\$/", $data ) )
				return true;
			break;
	}
	return false;
}

/**
 * Check whether serialized data is of string type.
 *
 * @since 2.0.5
 *
 * @param mixed $data Serialized data
 * @return bool False if not a serialized string, true if it is.
 */
function is_serialized_string( $data ) {
	// if it isn't a string, it isn't a serialized string
	if ( !is_string( $data ) )
		return false;
	$data = trim( $data );
	if ( preg_match( '/^s:[0-9]+:.*;$/s', $data ) ) // this should fetch all serialized strings
		return true;
	return false;
}

/**
 * Retrieve option value based on setting name.
 *
 * If the option does not exist or does not have a value, then the return value
 * will be false. This is useful to check whether you need to install an option
 * and is commonly used during installation of plugin options and to test
 * whether upgrading is required.
 *
 * You can "short-circuit" the retrieval of the option from the database for
 * your plugin or core options that aren't protected. You can do so by hooking
 * into the 'pre_option_$option' with the $option being replaced by the option
 * name. You should not try to override special options, but you will not be
 * prevented from doing so.
 *
 * There is a second filter called 'option_$option' with the $option being
 * replaced with the option name. This gives the value as the only parameter.
 *
 * If the option was serialized, when the option was added and, or updated, then
 * it will be unserialized, when it is returned.
 *
 * @since 1.5.0
 * @package WordPress
 * @subpackage Option
 * @uses apply_filters() Calls 'pre_option_$optionname' false to allow
 *		overwriting the option value in a plugin.
 * @uses apply_filters() Calls 'option_$optionname' with the option name value.
 *
 * @param string $setting Name of option to retrieve. Should already be SQL-escaped
 * @return mixed Value set for the option.
 */
function get_option( $setting, $default = false ) {
	global $wpdb;

	// Allow plugins to short-circuit options.
	$pre = apply_filters( 'pre_option_' . $setting, false );
	if ( false !== $pre )
		return $pre;

	// prevent non-existent options from triggering multiple queries
	$notoptions = wp_cache_get( 'notoptions', 'options' );
	if ( isset( $notoptions[$setting] ) )
		return $default;

	$alloptions = wp_load_alloptions();

	if ( isset( $alloptions[$setting] ) ) {
		$value = $alloptions[$setting];
	} else {
		$value = wp_cache_get( $setting, 'options' );

		if ( false === $value ) {
			if ( defined( 'WP_INSTALLING' ) )
				$suppress = $wpdb->suppress_errors();
			// expected_slashed ($setting)
			$row = $wpdb->get_row( "SELECT option_value FROM $wpdb->options WHERE option_name = '$setting' LIMIT 1" );
			if ( defined( 'WP_INSTALLING' ) )
				$wpdb->suppress_errors($suppress);

			if ( is_object( $row) ) { // Has to be get_row instead of get_var because of funkiness with 0, false, null values
				$value = $row->option_value;
				wp_cache_add( $setting, $value, 'options' );
			} else { // option does not exist, so we must cache its non-existence
				$notoptions[$setting] = true;
				wp_cache_set( 'notoptions', $notoptions, 'options' );
				return $default;
			}
		}
	}

	// If home is not set use siteurl.
	if ( 'home' == $setting && '' == $value )
		return get_option( 'siteurl' );

	if ( in_array( $setting, array('siteurl', 'home', 'category_base', 'tag_base') ) )
		$value = untrailingslashit( $value );

	return apply_filters( 'option_' . $setting, maybe_unserialize( $value ) );
}

/**
 * Protect WordPress special option from being modified.
 *
 * Will die if $option is in protected list. Protected options are 'alloptions'
 * and 'notoptions' options.
 *
 * @since 2.2.0
 * @package WordPress
 * @subpackage Option
 *
 * @param string $option Option name.
 */
function wp_protect_special_option( $option ) {
	$protected = array( 'alloptions', 'notoptions' );
	if ( in_array( $option, $protected ) )
		die( sprintf( __( '%s is a protected WP option and may not be modified' ), wp_specialchars( $option ) ) );
}

/**
 * Print option value after sanitizing for forms.
 *
 * @uses attr Sanitizes value.
 * @since 1.5.0
 * @package WordPress
 * @subpackage Option
 *
 * @param string $option Option name.
 */
function form_option( $option ) {
	echo esc_attr(get_option( $option ) );
}

/**
 * Retrieve all autoload options or all options, if no autoloaded ones exist.
 *
 * This is different from wp_load_alloptions() in that this function does not
 * cache its results and will retrieve all options from the database every time
 *
 * it is called.
 *
 * @since 1.0.0
 * @package WordPress
 * @subpackage Option
 * @uses apply_filters() Calls 'pre_option_$optionname' hook with option value as parameter.
 * @uses apply_filters() Calls 'all_options' on options list.
 *
 * @return array List of all options.
 */
function get_alloptions() {
	global $wpdb;
	$show = $wpdb->hide_errors();
	if ( !$options = $wpdb->get_results( "SELECT option_name, option_value FROM $wpdb->options WHERE autoload = 'yes'" ) )
		$options = $wpdb->get_results( "SELECT option_name, option_value FROM $wpdb->options" );
	$wpdb->show_errors($show);

	foreach ( (array) $options as $option ) {
		// "When trying to design a foolproof system,
		//  never underestimate the ingenuity of the fools :)" -- Dougal
		if ( in_array( $option->option_name, array( 'siteurl', 'home', 'category_base', 'tag_base' ) ) )
			$option->option_value = untrailingslashit( $option->option_value );
		$value = maybe_unserialize( $option->option_value );
		$all_options->{$option->option_name} = apply_filters( 'pre_option_' . $option->option_name, $value );
	}
	return apply_filters( 'all_options', $all_options );
}

/**
 * Loads and caches all autoloaded options, if available or all options.
 *
 * This is different from get_alloptions(), in that this function will cache the
 * options and will return the cached options when called again.
 *
 * @since 2.2.0
 * @package WordPress
 * @subpackage Option
 *
 * @return array List all options.
 */
function wp_load_alloptions() {
	global $wpdb;

	$alloptions = wp_cache_get( 'alloptions', 'options' );

	if ( !$alloptions ) {
		$suppress = $wpdb->suppress_errors();
		if ( !$alloptions_db = $wpdb->get_results( "SELECT option_name, option_value FROM $wpdb->options WHERE autoload = 'yes'" ) )
			$alloptions_db = $wpdb->get_results( "SELECT option_name, option_value FROM $wpdb->options" );
		$wpdb->suppress_errors($suppress);
		$alloptions = array();
		foreach ( (array) $alloptions_db as $o )
			$alloptions[$o->option_name] = $o->option_value;
		wp_cache_add( 'alloptions', $alloptions, 'options' );
	}
	return $alloptions;
}

/**
 * Update the value of an option that was already added.
 *
 * You do not need to serialize values, if the value needs to be serialize, then
 * it will be serialized before it is inserted into the database. Remember,
 * resources can not be serialized or added as an option.
 *
 * If the option does not exist, then the option will be added with the option
 * value, but you will not be able to set whether it is autoloaded. If you want
 * to set whether an option autoloaded, then you need to use the add_option().
 *
 * Before the option is updated, then the filter named
 * 'pre_update_option_$option_name', with the $option_name as the $option_name
 * parameter value, will be called. The hook should accept two parameters, the
 * first is the new value and the second is the old value.  Whatever is
 * returned will be used as the new value.
 * 
 * After the value has been updated the action named 'update_option_$option_name'
 * will be called.  This action receives two parameters the first being the old
 * value and the second the new value.
 *
 * @since 1.0.0
 * @package WordPress
 * @subpackage Option
 *
 * @param string $option_name Option name. Expected to not be SQL-escaped
 * @param mixed $newvalue Option value.
 * @return bool False if value was not updated and true if value was updated.
 */
function update_option( $option_name, $newvalue ) {
	global $wpdb;

	wp_protect_special_option( $option_name );

	$safe_option_name = $wpdb->escape( $option_name );
	$newvalue = sanitize_option( $option_name, $newvalue );

	$oldvalue = get_option( $safe_option_name );

	$newvalue = apply_filters( 'pre_update_option_' . $option_name, $newvalue, $oldvalue );

	// If the new and old values are the same, no need to update.
	if ( $newvalue === $oldvalue )
		return false;

	if ( false === $oldvalue ) {
		add_option( $option_name, $newvalue );
		return true;
	}

	$notoptions = wp_cache_get( 'notoptions', 'options' );
	if ( is_array( $notoptions ) && isset( $notoptions[$option_name] ) ) {
		unset( $notoptions[$option_name] );
		wp_cache_set( 'notoptions', $notoptions, 'options' );
	}

	$_newvalue = $newvalue;
	$newvalue = maybe_serialize( $newvalue );

	$alloptions = wp_load_alloptions();
	if ( isset( $alloptions[$option_name] ) ) {
		$alloptions[$option_name] = $newvalue;
		wp_cache_set( 'alloptions', $alloptions, 'options' );
	} else {
		wp_cache_set( $option_name, $newvalue, 'options' );
	}

	$wpdb->update($wpdb->options, array('option_value' => $newvalue), array('option_name' => $option_name) );

	if ( $wpdb->rows_affected == 1 ) {
		do_action( "update_option_{$option_name}", $oldvalue, $_newvalue );
		return true;
	}
	return false;
}

/**
 * Add a new option.
 *
 * You do not need to serialize values, if the value needs to be serialize, then
 * it will be serialized before it is inserted into the database. Remember,
 * resources can not be serialized or added as an option.
 *
 * You can create options without values and then add values later. Does not
 * check whether the option has already been added, but does check that you
 * aren't adding a protected WordPress option. Care should be taken to not name
 * options, the same as the ones which are protected and to not add options
 * that were already added.
 *
 * The filter named 'add_option_$optionname', with the $optionname being
 * replaced with the option's name, will be called. The hook should accept two
 * parameters, the first is the option name, and the second is the value.
 *
 * @package WordPress
 * @subpackage Option
 * @since 1.0.0
 * @link http://alex.vort-x.net/blog/ Thanks Alex Stapleton
 *
 * @param string $name Option name to add. Expects to NOT be SQL escaped.
 * @param mixed $value Optional. Option value, can be anything.
 * @param mixed $deprecated Optional. Description. Not used anymore.
 * @param bool $autoload Optional. Default is enabled. Whether to load the option when WordPress starts up.
 * @return null returns when finished.
 */
function add_option( $name, $value = '', $deprecated = '', $autoload = 'yes' ) {
	global $wpdb;

	wp_protect_special_option( $name );
	$safe_name = $wpdb->escape( $name );
	$value = sanitize_option( $name, $value );

	// Make sure the option doesn't already exist. We can check the 'notoptions' cache before we ask for a db query
	$notoptions = wp_cache_get( 'notoptions', 'options' );
	if ( !is_array( $notoptions ) || !isset( $notoptions[$name] ) )
		if ( false !== get_option( $safe_name ) )
			return;

	$value = maybe_serialize( $value );
	$autoload = ( 'no' === $autoload ) ? 'no' : 'yes';

	if ( 'yes' == $autoload ) {
		$alloptions = wp_load_alloptions();
		$alloptions[$name] = $value;
		wp_cache_set( 'alloptions', $alloptions, 'options' );
	} else {
		wp_cache_set( $name, $value, 'options' );
	}

	// This option exists now
	$notoptions = wp_cache_get( 'notoptions', 'options' ); // yes, again... we need it to be fresh
	if ( is_array( $notoptions ) && isset( $notoptions[$name] ) ) {
		unset( $notoptions[$name] );
		wp_cache_set( 'notoptions', $notoptions, 'options' );
	}

	$wpdb->insert($wpdb->options, array('option_name' => $name, 'option_value' => $value, 'autoload' => $autoload) );

	do_action( "add_option_{$name}", $name, $value );
	return;
}

/**
 * Removes option by name and prevents removal of protected WordPress options.
 *
 * @package WordPress
 * @subpackage Option
 * @since 1.2.0
 *
 * @param string $name Option name to remove.
 * @return bool True, if succeed. False, if failure.
 */
function delete_option( $name ) {
	global $wpdb;

	wp_protect_special_option( $name );

	// Get the ID, if no ID then return
	// expected_slashed ($name)
	$option = $wpdb->get_row( "SELECT option_id, autoload FROM $wpdb->options WHERE option_name = '$name'" );
	if ( is_null($option) || !$option->option_id )
		return false;
	// expected_slashed ($name)
	$wpdb->query( "DELETE FROM $wpdb->options WHERE option_name = '$name'" );
	if ( 'yes' == $option->autoload ) {
		$alloptions = wp_load_alloptions();
		if ( isset( $alloptions[$name] ) ) {
			unset( $alloptions[$name] );
			wp_cache_set( 'alloptions', $alloptions, 'options' );
		}
	} else {
		wp_cache_delete( $name, 'options' );
	}
	return true;
}

/**
 * Delete a transient
 *
 * @since 2.8.0
 * @package WordPress
 * @subpackage Transient
 *
 * @param string $transient Transient name. Expected to not be SQL-escaped
 * @return bool true if successful, false otherwise
 */
function delete_transient($transient) {
	global $_wp_using_ext_object_cache, $wpdb;

	if ( $_wp_using_ext_object_cache ) {
		return wp_cache_delete($transient, 'transient');
	} else {
		$transient = '_transient_' . $wpdb->escape($transient);
		return delete_option($transient);
	}
}

/**
 * Get the value of a transient
 *
 * If the transient does not exist or does not have a value, then the return value
 * will be false.
 *
 * @since 2.8.0
 * @package WordPress
 * @subpackage Transient
 *
 * @param string $transient Transient name. Expected to not be SQL-escaped
 * @return mixed Value of transient
 */
function get_transient($transient) {
	global $_wp_using_ext_object_cache, $wpdb;

	$pre = apply_filters( 'pre_transient_' . $transient, false );
	if ( false !== $pre )
		return $pre;

	if ( $_wp_using_ext_object_cache ) {
		$value = wp_cache_get($transient, 'transient');
	} else {
		$transient_option = '_transient_' . $wpdb->escape($transient);
		// If option is not in alloptions, it is not autoloaded and thus has a timeout
		$alloptions = wp_load_alloptions();
		if ( !isset( $alloptions[$transient_option] ) ) {
			$transient_timeout = '_transient_timeout_' . $wpdb->escape($transient);
			if ( get_option($transient_timeout) < time() ) {
				delete_option($transient_option);
				delete_option($transient_timeout);
				return false;
			}
		}

		$value = get_option($transient_option);
	}

	return apply_filters('transient_' . $transient, $value);
}

/**
 * Set/update the value of a transient
 *
 * You do not need to serialize values, if the value needs to be serialize, then
 * it will be serialized before it is set.
 *
 * @since 2.8.0
 * @package WordPress
 * @subpackage Transient
 *
 * @param string $transient Transient name. Expected to not be SQL-escaped
 * @param mixed $value Transient value.
 * @param int $expiration Time until expiration in seconds, default 0
 * @return bool False if value was not set and true if value was set.
 */
function set_transient($transient, $value, $expiration = 0) {
	global $_wp_using_ext_object_cache, $wpdb;

	if ( $_wp_using_ext_object_cache ) {
		return wp_cache_set($transient, $value, 'transient', $expiration);
	} else {
		$transient_timeout = '_transient_timeout_' . $transient;
		$transient = '_transient_' . $transient;
		$safe_transient = $wpdb->escape($transient);
		if ( false === get_option( $safe_transient ) ) {
			$autoload = 'yes';
			if ( 0 != $expiration ) {
				$autoload = 'no';
				add_option($transient_timeout, time() + $expiration, '', 'no');
			}
			return add_option($transient, $value, '', $autoload);
		} else {
			if ( 0 != $expiration )
				update_option($transient_timeout, time() + $expiration);
			return update_option($transient, $value);
		}
	}
}

/**
 * Saves and restores user interface settings stored in a cookie.
 *
 * Checks if the current user-settings cookie is updated and stores it. When no
 * cookie exists (different browser used), adds the last saved cookie restoring
 * the settings.
 *
 * @package WordPress
 * @subpackage Option
 * @since 2.7.0
 */
function wp_user_settings() {

	if ( ! is_admin() )
		return;

	if ( defined('DOING_AJAX') )
		return;

	if ( ! $user = wp_get_current_user() )
		return;

	$settings = get_user_option( 'user-settings', $user->ID, false );

	if ( isset( $_COOKIE['wp-settings-' . $user->ID] ) ) {
		$cookie = preg_replace( '/[^A-Za-z0-9=&_]/', '', $_COOKIE['wp-settings-' . $user->ID] );

		if ( ! empty( $cookie ) && strpos( $cookie, '=' ) ) {
			if ( $cookie == $settings )
				return;

			$last_time = (int) get_user_option( 'user-settings-time', $user->ID, false );
			$saved = isset( $_COOKIE['wp-settings-time-' . $user->ID]) ? preg_replace( '/[^0-9]/', '', $_COOKIE['wp-settings-time-' . $user->ID] ) : 0;

			if ( $saved > $last_time ) {
				update_user_option( $user->ID, 'user-settings', $cookie, false );
				update_user_option( $user->ID, 'user-settings-time', time() - 5, false );
				return;
			}
		}
	}

	setcookie( 'wp-settings-' . $user->ID, $settings, time() + 31536000, SITECOOKIEPATH );
	setcookie( 'wp-settings-time-' . $user->ID, time(), time() + 31536000, SITECOOKIEPATH );
}

/**
 * Retrieve user interface setting value based on setting name.
 *
 * @package WordPress
 * @subpackage Option
 * @since 2.7.0
 *
 * @param string $name The name of the setting.
 * @param string $default Optional default value to return when $name is not set.
 * @return mixed the last saved user setting or the default value/false if it doesn't exist.
 */
function get_user_setting( $name, $default = false ) {

	$arr = get_all_user_settings();

	return isset($arr[$name]) ? $arr[$name] : $default;
}

/**
 * Delete user interface settings.
 *
 * Deleting settings would reset them to the defaults.
 *
 * @package WordPress
 * @subpackage Option
 * @since 2.7.0
 *
 * @param mixed $names The name or array of names of the setting to be deleted.
 */
function delete_user_setting( $names ) {
	global $current_user;

	$arr = get_all_user_settings();
	$names = (array) $names;

	foreach ( $names as $name ) {
		if ( isset($arr[$name]) ) {
			unset($arr[$name]);
			$settings = '';
		}
	}

	if ( isset($settings) ) {
		foreach ( $arr as $k => $v )
			$settings .= $k . '=' . $v . '&';

		$settings = rtrim($settings, '&');

		update_user_option( $current_user->ID, 'user-settings', $settings );
		setcookie('wp-settings-' . $current_user->ID, $settings, time() + 31536000, SITECOOKIEPATH);
	}
}

/**
 * Retrieve all user interface settings.
 *
 * @package WordPress
 * @subpackage Option
 * @since 2.7.0
 *
 * @return array the last saved user settings or empty array.
 */
function get_all_user_settings() {
	if ( ! $user = wp_get_current_user() )
		return array();

	$arr = array();
	if ( isset($_COOKIE['wp-settings-' . $user->ID]) ) {
		$cookie = preg_replace( '/[^A-Za-z0-9=&_]/', '', $_COOKIE['wp-settings-' . $user->ID] );

		if ( $cookie && strpos($cookie, '=') ) // the '=' cannot be 1st char
			parse_str($cookie, $arr);

	} elseif ( isset($user->wp_usersettings) && is_string($user->wp_usersettings) ) {
		parse_str( $user->wp_usersettings, $arr );
	}

	return $arr;
}

/**
 * Delete the user settings of the current user.
 *
 * @package WordPress
 * @subpackage Option
 * @since 2.7.0
 */
function delete_all_user_settings() {
	if ( ! $user = wp_get_current_user() )
		return;

	delete_usermeta( $user->ID, 'user-settings' );
	setcookie('wp-settings-'.$user->ID, ' ', time() - 31536000, SITECOOKIEPATH);
}

/**
 * Serialize data, if needed.
 *
 * @since 2.0.5
 *
 * @param mixed $data Data that might be serialized.
 * @return mixed A scalar data
 */
function maybe_serialize( $data ) {
	if ( is_array( $data ) || is_object( $data ) )
		return serialize( $data );

	if ( is_serialized( $data ) )
		return serialize( $data );

	return $data;
}

/**
 * Strip HTML and put links at the bottom of stripped content.
 *
 * Searches for all of the links, strips them out of the content, and places
 * them at the bottom of the content with numbers.
 *
 * @since 0.71
 *
 * @param string $content Content to get links
 * @return string HTML stripped out of content with links at the bottom.
 */
function make_url_footnote( $content ) {
	preg_match_all( '/<a(.+?)href=\"(.+?)\"(.*?)>(.+?)<\/a>/', $content, $matches );
	$links_summary = "\n";
	for ( $i=0; $i<count($matches[0]); $i++ ) {
		$link_match = $matches[0][$i];
		$link_number = '['.($i+1).']';
		$link_url = $matches[2][$i];
		$link_text = $matches[4][$i];
		$content = str_replace( $link_match, $link_text . ' ' . $link_number, $content );
		$link_url = ( ( strtolower( substr( $link_url, 0, 7 ) ) != 'http://' ) && ( strtolower( substr( $link_url, 0, 8 ) ) != 'https://' ) ) ? get_option( 'home' ) . $link_url : $link_url;
		$links_summary .= "\n" . $link_number . ' ' . $link_url;
	}
	$content  = strip_tags( $content );
	$content .= $links_summary;
	return $content;
}

/**
 * Retrieve post title from XMLRPC XML.
 *
 * If the title element is not part of the XML, then the default post title from
 * the $post_default_title will be used instead.
 *
 * @package WordPress
 * @subpackage XMLRPC
 * @since 0.71
 *
 * @global string $post_default_title Default XMLRPC post title.
 *
 * @param string $content XMLRPC XML Request content
 * @return string Post title
 */
function xmlrpc_getposttitle( $content ) {
	global $post_default_title;
	if ( preg_match( '/<title>(.+?)<\/title>/is', $content, $matchtitle ) ) {
		$post_title = $matchtitle[1];
	} else {
		$post_title = $post_default_title;
	}
	return $post_title;
}

/**
 * Retrieve the post category or categories from XMLRPC XML.
 *
 * If the category element is not found, then the default post category will be
 * used. The return type then would be what $post_default_category. If the
 * category is found, then it will always be an array.
 *
 * @package WordPress
 * @subpackage XMLRPC
 * @since 0.71
 *
 * @global string $post_default_category Default XMLRPC post category.
 *
 * @param string $content XMLRPC XML Request content
 * @return string|array List of categories or category name.
 */
function xmlrpc_getpostcategory( $content ) {
	global $post_default_category;
	if ( preg_match( '/<category>(.+?)<\/category>/is', $content, $matchcat ) ) {
		$post_category = trim( $matchcat[1], ',' );
		$post_category = explode( ',', $post_category );
	} else {
		$post_category = $post_default_category;
	}
	return $post_category;
}

/**
 * XMLRPC XML content without title and category elements.
 *
 * @package WordPress
 * @subpackage XMLRPC
 * @since 0.71
 *
 * @param string $content XMLRPC XML Request content
 * @return string XMLRPC XML Request content without title and category elements.
 */
function xmlrpc_removepostdata( $content ) {
	$content = preg_replace( '/<title>(.+?)<\/title>/si', '', $content );
	$content = preg_replace( '/<category>(.+?)<\/category>/si', '', $content );
	$content = trim( $content );
	return $content;
}

/**
 * Open the file handle for debugging.
 *
 * This function is used for XMLRPC feature, but it is general purpose enough
 * to be used in anywhere.
 *
 * @see fopen() for mode options.
 * @package WordPress
 * @subpackage Debug
 * @since 0.71
 * @uses $debug Used for whether debugging is enabled.
 *
 * @param string $filename File path to debug file.
 * @param string $mode Same as fopen() mode parameter.
 * @return bool|resource File handle. False on failure.
 */
function debug_fopen( $filename, $mode ) {
	global $debug;
	if ( 1 == $debug ) {
		$fp = fopen( $filename, $mode );
		return $fp;
	} else {
		return false;
	}
}

/**
 * Write contents to the file used for debugging.
 *
 * Technically, this can be used to write to any file handle when the global
 * $debug is set to 1 or true.
 *
 * @package WordPress
 * @subpackage Debug
 * @since 0.71
 * @uses $debug Used for whether debugging is enabled.
 *
 * @param resource $fp File handle for debugging file.
 * @param string $string Content to write to debug file.
 */
function debug_fwrite( $fp, $string ) {
	global $debug;
	if ( 1 == $debug )
		fwrite( $fp, $string );
}

/**
 * Close the debugging file handle.
 *
 * Technically, this can be used to close any file handle when the global $debug
 * is set to 1 or true.
 *
 * @package WordPress
 * @subpackage Debug
 * @since 0.71
 * @uses $debug Used for whether debugging is enabled.
 *
 * @param resource $fp Debug File handle.
 */
function debug_fclose( $fp ) {
	global $debug;
	if ( 1 == $debug )
		fclose( $fp );
}

/**
 * Check content for video and audio links to add as enclosures.
 *
 * Will not add enclosures that have already been added. This is called as
 * pingbacks and trackbacks.
 *
 * @package WordPress
 * @since 1.5.0
 *
 * @uses $wpdb
 *
 * @param string $content Post Content
 * @param int $post_ID Post ID
 */
function do_enclose( $content, $post_ID ) {
	global $wpdb;
	include_once( ABSPATH . WPINC . '/class-IXR.php' );

	$log = debug_fopen( ABSPATH . 'enclosures.log', 'a' );
	$post_links = array();
	debug_fwrite( $log, 'BEGIN ' . date( 'YmdHis', time() ) . "\n" );

	$pung = get_enclosed( $post_ID );

	$ltrs = '\w';
	$gunk = '/#~:.?+=&%@!\-';
	$punc = '.:?\-';
	$any = $ltrs . $gunk . $punc;

	preg_match_all( "{\b http : [$any] +? (?= [$punc] * [^$any] | $)}x", $content, $post_links_temp );

	debug_fwrite( $log, 'Post contents:' );
	debug_fwrite( $log, $content . "\n" );

	foreach ( (array) $post_links_temp[0] as $link_test ) {
		if ( !in_array( $link_test, $pung ) ) { // If we haven't pung it already
			$test = parse_url( $link_test );
			if ( isset( $test['query'] ) )
				$post_links[] = $link_test;
			elseif ( $test['path'] != '/' && $test['path'] != '' )
				$post_links[] = $link_test;
		}
	}

	foreach ( (array) $post_links as $url ) {
		if ( $url != '' && !$wpdb->get_var( $wpdb->prepare( "SELECT post_id FROM $wpdb->postmeta WHERE post_id = %d AND meta_key = 'enclosure' AND meta_value LIKE (%s)", $post_ID, $url . '%' ) ) ) {
			if ( $headers = wp_get_http_headers( $url) ) {
				$len = (int) $headers['content-length'];
				$type = $headers['content-type'];
				$allowed_types = array( 'video', 'audio' );
				if ( in_array( substr( $type, 0, strpos( $type, "/" ) ), $allowed_types ) ) {
					$meta_value = "$url\n$len\n$type\n";
					$wpdb->insert($wpdb->postmeta, array('post_id' => $post_ID, 'meta_key' => 'enclosure', 'meta_value' => $meta_value) );
				}
			}
		}
	}
}

/**
 * Perform a HTTP HEAD or GET request.
 *
 * If $file_path is a writable filename, this will do a GET request and write
 * the file to that path.
 *
 * @since 2.5.0
 *
 * @param string $url URL to fetch.
 * @param string|bool $file_path Optional. File path to write request to.
 * @param bool $deprecated Deprecated. Not used.
 * @return bool|string False on failure and string of headers if HEAD request.
 */
function wp_get_http( $url, $file_path = false, $deprecated = false ) {
	@set_time_limit( 60 );

	$options = array();
	$options['redirection'] = 5;

	if ( false == $file_path )
		$options['method'] = 'HEAD';
	else
		$options['method'] = 'GET';

	$response = wp_remote_request($url, $options);

	if ( is_wp_error( $response ) )
		return false;

	$headers = wp_remote_retrieve_headers( $response );
	$headers['response'] = $response['response']['code'];

	if ( false == $file_path )
		return $headers;

	// GET request - write it to the supplied filename
	$out_fp = fopen($file_path, 'w');
	if ( !$out_fp )
		return $headers;

	fwrite( $out_fp,  $response['body']);
	fclose($out_fp);

	return $headers;
}

/**
 * Retrieve HTTP Headers from URL.
 *
 * @since 1.5.1
 *
 * @param string $url
 * @param bool $deprecated Not Used.
 * @return bool|string False on failure, headers on success.
 */
function wp_get_http_headers( $url, $deprecated = false ) {
	$response = wp_remote_head( $url );

	if ( is_wp_error( $response ) )
		return false;

	return wp_remote_retrieve_headers( $response );
}

/**
 * Whether today is a new day.
 *
 * @since 0.71
 * @uses $day Today
 * @uses $previousday Previous day
 *
 * @return int 1 when new day, 0 if not a new day.
 */
function is_new_day() {
	global $day, $previousday;
	if ( $day != $previousday )
		return 1;
	else
		return 0;
}

/**
 * Build URL query based on an associative and, or indexed array.
 *
 * This is a convenient function for easily building url queries. It sets the
 * separator to '&' and uses _http_build_query() function.
 *
 * @see _http_build_query() Used to build the query
 * @link http://us2.php.net/manual/en/function.http-build-query.php more on what
 *		http_build_query() does.
 *
 * @since 2.3.0
 *
 * @param array $data URL-encode key/value pairs.
 * @return string URL encoded string
 */
function build_query( $data ) {
	return _http_build_query( $data, null, '&', '', false );
}

/**
 * Retrieve a modified URL query string.
 *
 * You can rebuild the URL and append a new query variable to the URL query by
 * using this function. You can also retrieve the full URL with query data.
 *
 * Adding a single key & value or an associative array. Setting a key value to
 * emptystring removes the key. Omitting oldquery_or_uri uses the $_SERVER
 * value.
 *
 * @since 1.5.0
 *
 * @param mixed $param1 Either newkey or an associative_array
 * @param mixed $param2 Either newvalue or oldquery or uri
 * @param mixed $param3 Optional. Old query or uri
 * @return string New URL query string.
 */
function add_query_arg() {
	$ret = '';
	if ( is_array( func_get_arg(0) ) ) {
		if ( @func_num_args() < 2 || false === @func_get_arg( 1 ) )
			$uri = $_SERVER['REQUEST_URI'];
		else
			$uri = @func_get_arg( 1 );
	} else {
		if ( @func_num_args() < 3 || false === @func_get_arg( 2 ) )
			$uri = $_SERVER['REQUEST_URI'];
		else
			$uri = @func_get_arg( 2 );
	}

	if ( $frag = strstr( $uri, '#' ) )
		$uri = substr( $uri, 0, -strlen( $frag ) );
	else
		$frag = '';

	if ( preg_match( '|^https?://|i', $uri, $matches ) ) {
		$protocol = $matches[0];
		$uri = substr( $uri, strlen( $protocol ) );
	} else {
		$protocol = '';
	}

	if ( strpos( $uri, '?' ) !== false ) {
		$parts = explode( '?', $uri, 2 );
		if ( 1 == count( $parts ) ) {
			$base = '?';
			$query = $parts[0];
		} else {
			$base = $parts[0] . '?';
			$query = $parts[1];
		}
	} elseif ( !empty( $protocol ) || strpos( $uri, '=' ) === false ) {
		$base = $uri . '?';
		$query = '';
	} else {
		$base = '';
		$query = $uri;
	}

	wp_parse_str( $query, $qs );
	$qs = urlencode_deep( $qs ); // this re-URL-encodes things that were already in the query string
	if ( is_array( func_get_arg( 0 ) ) ) {
		$kayvees = func_get_arg( 0 );
		$qs = array_merge( $qs, $kayvees );
	} else {
		$qs[func_get_arg( 0 )] = func_get_arg( 1 );
	}

	foreach ( (array) $qs as $k => $v ) {
		if ( $v === false )
			unset( $qs[$k] );
	}

	$ret = build_query( $qs );
	$ret = trim( $ret, '?' );
	$ret = preg_replace( '#=(&|$)#', '$1', $ret );
	$ret = $protocol . $base . $ret . $frag;
	$ret = rtrim( $ret, '?' );
	return $ret;
}

/**
 * Removes an item or list from the query string.
 *
 * @since 1.5.0
 *
 * @param string|array $key Query key or keys to remove.
 * @param bool $query When false uses the $_SERVER value.
 * @return string New URL query string.
 */
function remove_query_arg( $key, $query=false ) {
	if ( is_array( $key ) ) { // removing multiple keys
		foreach ( $key as $k )
			$query = add_query_arg( $k, false, $query );
		return $query;
	}
	return add_query_arg( $key, false, $query );
}

/**
 * Walks the array while sanitizing the contents.
 *
 * @uses $wpdb Used to sanitize values
 * @since 0.71
 *
 * @param array $array Array to used to walk while sanitizing contents.
 * @return array Sanitized $array.
 */
function add_magic_quotes( $array ) {
	global $wpdb;

	foreach ( (array) $array as $k => $v ) {
		if ( is_array( $v ) ) {
			$array[$k] = add_magic_quotes( $v );
		} else {
			$array[$k] = $wpdb->escape( $v );
		}
	}
	return $array;
}

/**
 * HTTP request for URI to retrieve content.
 *
 * @since 1.5.1
 * @uses wp_remote_get()
 *
 * @param string $uri URI/URL of web page to retrieve.
 * @return bool|string HTTP content. False on failure.
 */
function wp_remote_fopen( $uri ) {
	$parsed_url = @parse_url( $uri );

	if ( !$parsed_url || !is_array( $parsed_url ) )
		return false;

	$options = array();
	$options['timeout'] = 10;

	$response = wp_remote_get( $uri, $options );

	if ( is_wp_error( $response ) )
		return false;

	return $response['body'];
}

/**
 * Setup the WordPress query.
 *
 * @since 2.0.0
 *
 * @param string $query_vars Default WP_Query arguments.
 */
function wp( $query_vars = '' ) {
	global $wp, $wp_query, $wp_the_query;
	$wp->main( $query_vars );

	if( !isset($wp_the_query) )
		$wp_the_query = $wp_query;
}

/**
 * Retrieve the description for the HTTP status.
 *
 * @since 2.3.0
 *
 * @param int $code HTTP status code.
 * @return string Empty string if not found, or description if found.
 */
function get_status_header_desc( $code ) {
	global $wp_header_to_desc;

	$code = absint( $code );

	if ( !isset( $wp_header_to_desc ) ) {
		$wp_header_to_desc = array(
			100 => 'Continue',
			101 => 'Switching Protocols',
			102 => 'Processing',

			200 => 'OK',
			201 => 'Created',
			202 => 'Accepted',
			203 => 'Non-Authoritative Information',
			204 => 'No Content',
			205 => 'Reset Content',
			206 => 'Partial Content',
			207 => 'Multi-Status',
			226 => 'IM Used',

			300 => 'Multiple Choices',
			301 => 'Moved Permanently',
			302 => 'Found',
			303 => 'See Other',
			304 => 'Not Modified',
			305 => 'Use Proxy',
			306 => 'Reserved',
			307 => 'Temporary Redirect',

			400 => 'Bad Request',
			401 => 'Unauthorized',
			402 => 'Payment Required',
			403 => 'Forbidden',
			404 => 'Not Found',
			405 => 'Method Not Allowed',
			406 => 'Not Acceptable',
			407 => 'Proxy Authentication Required',
			408 => 'Request Timeout',
			409 => 'Conflict',
			410 => 'Gone',
			411 => 'Length Required',
			412 => 'Precondition Failed',
			413 => 'Request Entity Too Large',
			414 => 'Request-URI Too Long',
			415 => 'Unsupported Media Type',
			416 => 'Requested Range Not Satisfiable',
			417 => 'Expectation Failed',
			422 => 'Unprocessable Entity',
			423 => 'Locked',
			424 => 'Failed Dependency',
			426 => 'Upgrade Required',

			500 => 'Internal Server Error',
			501 => 'Not Implemented',
			502 => 'Bad Gateway',
			503 => 'Service Unavailable',
			504 => 'Gateway Timeout',
			505 => 'HTTP Version Not Supported',
			506 => 'Variant Also Negotiates',
			507 => 'Insufficient Storage',
			510 => 'Not Extended'
		);
	}

	if ( isset( $wp_header_to_desc[$code] ) )
		return $wp_header_to_desc[$code];
	else
		return '';
}

/**
 * Set HTTP status header.
 *
 * @since 2.0.0
 * @uses apply_filters() Calls 'status_header' on status header string, HTTP
 *		HTTP code, HTTP code description, and protocol string as separate
 *		parameters.
 *
 * @param int $header HTTP status code
 * @return null Does not return anything.
 */
function status_header( $header ) {
	$text = get_status_header_desc( $header );

	if ( empty( $text ) )
		return false;

	$protocol = $_SERVER["SERVER_PROTOCOL"];
	if ( 'HTTP/1.1' != $protocol && 'HTTP/1.0' != $protocol )
		$protocol = 'HTTP/1.0';
	$status_header = "$protocol $header $text";
	if ( function_exists( 'apply_filters' ) )
		$status_header = apply_filters( 'status_header', $status_header, $header, $text, $protocol );

	return @header( $status_header, true, $header );
}

/**
 * Gets the header information to prevent caching.
 *
 * The several different headers cover the different ways cache prevention is handled
 * by different browsers
 *
 * @since 2.8
 *
 * @uses apply_filters()
 * @return array The associative array of header names and field values.
 */
function wp_get_nocache_headers() {
	$headers = array(
		'Expires' => 'Wed, 11 Jan 1984 05:00:00 GMT',
		'Last-Modified' => gmdate( 'D, d M Y H:i:s' ) . ' GMT',
		'Cache-Control' => 'no-cache, must-revalidate, max-age=0',
		'Pragma' => 'no-cache',
	);

	if ( function_exists('apply_filters') ) {
		$headers = apply_filters('nocache_headers', $headers);
	}
	return $headers;
}

/**
 * Sets the headers to prevent caching for the different browsers.
 *
 * Different browsers support different nocache headers, so several headers must
 * be sent so that all of them get the point that no caching should occur.
 *
 * @since 2.0.0
 * @uses wp_get_nocache_headers()
 */
function nocache_headers() {
	$headers = wp_get_nocache_headers();
	foreach( (array) $headers as $name => $field_value )
		@header("{$name}: {$field_value}");
}

/**
 * Set the headers for caching for 10 days with JavaScript content type.
 *
 * @since 2.1.0
 */
function cache_javascript_headers() {
	$expiresOffset = 864000; // 10 days
	header( "Content-Type: text/javascript; charset=" . get_bloginfo( 'charset' ) );
	header( "Vary: Accept-Encoding" ); // Handle proxies
	header( "Expires: " . gmdate( "D, d M Y H:i:s", time() + $expiresOffset ) . " GMT" );
}

/**
 * Retrieve the number of database queries during the WordPress execution.
 *
 * @since 2.0.0
 *
 * @return int Number of database queries
 */
function get_num_queries() {
	global $wpdb;
	return $wpdb->num_queries;
}

/**
 * Whether input is yes or no. Must be 'y' to be true.
 *
 * @since 1.0.0
 *
 * @param string $yn Character string containing either 'y' or 'n'
 * @return bool True if yes, false on anything else
 */
function bool_from_yn( $yn ) {
	return ( strtolower( $yn ) == 'y' );
}

/**
 * Loads the feed template from the use of an action hook.
 *
 * If the feed action does not have a hook, then the function will die with a
 * message telling the visitor that the feed is not valid.
 *
 * It is better to only have one hook for each feed.
 *
 * @since 2.1.0
 * @uses $wp_query Used to tell if the use a comment feed.
 * @uses do_action() Calls 'do_feed_$feed' hook, if a hook exists for the feed.
 */
function do_feed() {
	global $wp_query;

	$feed = get_query_var( 'feed' );

	// Remove the pad, if present.
	$feed = preg_replace( '/^_+/', '', $feed );

	if ( $feed == '' || $feed == 'feed' )
		$feed = get_default_feed();

	$hook = 'do_feed_' . $feed;
	if ( !has_action($hook) ) {
		$message = sprintf( __( 'ERROR: %s is not a valid feed template' ), wp_specialchars($feed));
		wp_die($message);
	}

	do_action( $hook, $wp_query->is_comment_feed );
}

/**
 * Load the RDF RSS 0.91 Feed template.
 *
 * @since 2.1.0
 */
function do_feed_rdf() {
	load_template( ABSPATH . WPINC . '/feed-rdf.php' );
}

/**
 * Load the RSS 1.0 Feed Template
 *
 * @since 2.1.0
 */
function do_feed_rss() {
	load_template( ABSPATH . WPINC . '/feed-rss.php' );
}

/**
 * Load either the RSS2 comment feed or the RSS2 posts feed.
 *
 * @since 2.1.0
 *
 * @param bool $for_comments True for the comment feed, false for normal feed.
 */
function do_feed_rss2( $for_comments ) {
	if ( $for_comments )
		load_template( ABSPATH . WPINC . '/feed-rss2-comments.php' );
	else
		load_template( ABSPATH . WPINC . '/feed-rss2.php' );
}

/**
 * Load either Atom comment feed or Atom posts feed.
 *
 * @since 2.1.0
 *
 * @param bool $for_comments True for the comment feed, false for normal feed.
 */
function do_feed_atom( $for_comments ) {
	if ($for_comments)
		load_template( ABSPATH . WPINC . '/feed-atom-comments.php');
	else
		load_template( ABSPATH . WPINC . '/feed-atom.php' );
}

/**
 * Display the robot.txt file content.
 *
 * The echo content should be with usage of the permalinks or for creating the
 * robot.txt file.
 *
 * @since 2.1.0
 * @uses do_action() Calls 'do_robotstxt' hook for displaying robot.txt rules.
 */
function do_robots() {
	header( 'Content-Type: text/plain; charset=utf-8' );

	do_action( 'do_robotstxt' );

	if ( '0' == get_option( 'blog_public' ) ) {
		echo "User-agent: *\n";
		echo "Disallow: /\n";
	} else {
		echo "User-agent: *\n";
		echo "Disallow:\n";
	}
}

/**
 * Test whether blog is already installed.
 *
 * The cache will be checked first. If you have a cache plugin, which saves the
 * cache values, then this will work. If you use the default WordPress cache,
 * and the database goes away, then you might have problems.
 *
 * Checks for the option siteurl for whether WordPress is installed.
 *
 * @since 2.1.0
 * @uses $wpdb
 *
 * @return bool Whether blog is already installed.
 */
function is_blog_installed() {
	global $wpdb;

	// Check cache first. If options table goes away and we have true cached, oh well.
	if ( wp_cache_get( 'is_blog_installed' ) )
		return true;

	$suppress = $wpdb->suppress_errors();
	$alloptions = wp_load_alloptions();
	// If siteurl is not set to autoload, check it specifically
	if ( !isset( $alloptions['siteurl'] ) )
		$installed = $wpdb->get_var( "SELECT option_value FROM $wpdb->options WHERE option_name = 'siteurl'" );
	else
		$installed = $alloptions['siteurl'];
	$wpdb->suppress_errors( $suppress );

	$installed = !empty( $installed );
	wp_cache_set( 'is_blog_installed', $installed );

	return $installed;
}

/**
 * Retrieve URL with nonce added to URL query.
 *
 * @package WordPress
 * @subpackage Security
 * @since 2.0.4
 *
 * @param string $actionurl URL to add nonce action
 * @param string $action Optional. Nonce action name
 * @return string URL with nonce action added.
 */
function wp_nonce_url( $actionurl, $action = -1 ) {
	$actionurl = str_replace( '&amp;', '&', $actionurl );
	return wp_specialchars( add_query_arg( '_wpnonce', wp_create_nonce( $action ), $actionurl ) );
}

/**
 * Retrieve or display nonce hidden field for forms.
 *
 * The nonce field is used to validate that the contents of the form came from
 * the location on the current site and not somewhere else. The nonce does not
 * offer absolute protection, but should protect against most cases. It is very
 * important to use nonce field in forms.
 *
 * If you set $echo to true and set $referer to true, then you will need to
 * retrieve the {@link wp_referer_field() wp referer field}. If you have the
 * $referer set to true and are echoing the nonce field, it will also echo the
 * referer field.
 *
 * The $action and $name are optional, but if you want to have better security,
 * it is strongly suggested to set those two parameters. It is easier to just
 * call the function without any parameters, because validation of the nonce
 * doesn't require any parameters, but since crackers know what the default is
 * it won't be difficult for them to find a way around your nonce and cause
 * damage.
 *
 * The input name will be whatever $name value you gave. The input value will be
 * the nonce creation value.
 *
 * @package WordPress
 * @subpackage Security
 * @since 2.0.4
 *
 * @param string $action Optional. Action name.
 * @param string $name Optional. Nonce name.
 * @param bool $referer Optional, default true. Whether to set the referer field for validation.
 * @param bool $echo Optional, default true. Whether to display or return hidden form field.
 * @return string Nonce field.
 */
function wp_nonce_field( $action = -1, $name = "_wpnonce", $referer = true , $echo = true ) {
	$name = esc_attr( $name );
	$nonce_field = '<input type="hidden" id="' . $name . '" name="' . $name . '" value="' . wp_create_nonce( $action ) . '" />';
	if ( $echo )
		echo $nonce_field;

	if ( $referer )
		wp_referer_field( $echo, 'previous' );

	return $nonce_field;
}

/**
 * Retrieve or display referer hidden field for forms.
 *
 * The referer link is the current Request URI from the server super global. The
 * input name is '_wp_http_referer', in case you wanted to check manually.
 *
 * @package WordPress
 * @subpackage Security
 * @since 2.0.4
 *
 * @param bool $echo Whether to echo or return the referer field.
 * @return string Referer field.
 */
function wp_referer_field( $echo = true) {
	$ref = esc_attr( $_SERVER['REQUEST_URI'] );
	$referer_field = '<input type="hidden" name="_wp_http_referer" value="'. $ref . '" />';

	if ( $echo )
		echo $referer_field;
	return $referer_field;
}

/**
 * Retrieve or display original referer hidden field for forms.
 *
 * The input name is '_wp_original_http_referer' and will be either the same
 * value of {@link wp_referer_field()}, if that was posted already or it will
 * be the current page, if it doesn't exist.
 *
 * @package WordPress
 * @subpackage Security
 * @since 2.0.4
 *
 * @param bool $echo Whether to echo the original http referer
 * @param string $jump_back_to Optional, default is 'current'. Can be 'previous' or page you want to jump back to.
 * @return string Original referer field.
 */
function wp_original_referer_field( $echo = true, $jump_back_to = 'current' ) {
	$jump_back_to = ( 'previous' == $jump_back_to ) ? wp_get_referer() : $_SERVER['REQUEST_URI'];
	$ref = ( wp_get_original_referer() ) ? wp_get_original_referer() : $jump_back_to;
	$orig_referer_field = '<input type="hidden" name="_wp_original_http_referer" value="' . esc_attr( stripslashes( $ref ) ) . '" />';
	if ( $echo )
		echo $orig_referer_field;
	return $orig_referer_field;
}

/**
 * Retrieve referer from '_wp_http_referer', HTTP referer, or current page respectively.
 *
 * @package WordPress
 * @subpackage Security
 * @since 2.0.4
 *
 * @return string|bool False on failure. Referer URL on success.
 */
function wp_get_referer() {
	$ref = '';
	if ( ! empty( $_REQUEST['_wp_http_referer'] ) )
		$ref = $_REQUEST['_wp_http_referer'];
	else if ( ! empty( $_SERVER['HTTP_REFERER'] ) )
		$ref = $_SERVER['HTTP_REFERER'];

	if ( $ref !== $_SERVER['REQUEST_URI'] )
		return $ref;
	return false;
}

/**
 * Retrieve original referer that was posted, if it exists.
 *
 * @package WordPress
 * @subpackage Security
 * @since 2.0.4
 *
 * @return string|bool False if no original referer or original referer if set.
 */
function wp_get_original_referer() {
	if ( !empty( $_REQUEST['_wp_original_http_referer'] ) )
		return $_REQUEST['_wp_original_http_referer'];
	return false;
}

/**
 * Recursive directory creation based on full path.
 *
 * Will attempt to set permissions on folders.
 *
 * @since 2.0.1
 *
 * @param string $target Full path to attempt to create.
 * @return bool Whether the path was created or not. True if path already exists.
 */
function wp_mkdir_p( $target ) {
	// from php.net/mkdir user contributed notes
	$target = str_replace( '//', '/', $target );
	if ( file_exists( $target ) )
		return @is_dir( $target );

	// Attempting to create the directory may clutter up our display.
	if ( @mkdir( $target ) ) {
		$stat = @stat( dirname( $target ) );
		$dir_perms = $stat['mode'] & 0007777;  // Get the permission bits.
		@chmod( $target, $dir_perms );
		return true;
	} elseif ( is_dir( dirname( $target ) ) ) {
			return false;
	}

	// If the above failed, attempt to create the parent node, then try again.
	if ( ( $target != '/' ) && ( wp_mkdir_p( dirname( $target ) ) ) )
		return wp_mkdir_p( $target );

	return false;
}

/**
 * Test if a give filesystem path is absolute ('/foo/bar', 'c:\windows').
 *
 * @since 2.5.0
 *
 * @param string $path File path
 * @return bool True if path is absolute, false is not absolute.
 */
function path_is_absolute( $path ) {
	// this is definitive if true but fails if $path does not exist or contains a symbolic link
	if ( realpath($path) == $path )
		return true;

	if ( strlen($path) == 0 || $path{0} == '.' )
		return false;

	// windows allows absolute paths like this
	if ( preg_match('#^[a-zA-Z]:\\\\#', $path) )
		return true;

	// a path starting with / or \ is absolute; anything else is relative
	return (bool) preg_match('#^[/\\\\]#', $path);
}

/**
 * Join two filesystem paths together (e.g. 'give me $path relative to $base').
 *
 * If the $path is absolute, then it the full path is returned.
 *
 * @since 2.5.0
 *
 * @param string $base
 * @param string $path
 * @return string The path with the base or absolute path.
 */
function path_join( $base, $path ) {
	if ( path_is_absolute($path) )
		return $path;

	return rtrim($base, '/') . '/' . ltrim($path, '/');
}

/**
 * Get an array containing the current upload directory's path and url.
 *
 * Checks the 'upload_path' option, which should be from the web root folder,
 * and if it isn't empty it will be used. If it is empty, then the path will be
 * 'WP_CONTENT_DIR/uploads'. If the 'UPLOADS' constant is defined, then it will
 * override the 'upload_path' option and 'WP_CONTENT_DIR/uploads' path.
 *
 * The upload URL path is set either by the 'upload_url_path' option or by using
 * the 'WP_CONTENT_URL' constant and appending '/uploads' to the path.
 *
 * If the 'uploads_use_yearmonth_folders' is set to true (checkbox if checked in
 * the administration settings panel), then the time will be used. The format
 * will be year first and then month.
 *
 * If the path couldn't be created, then an error will be returned with the key
 * 'error' containing the error message. The error suggests that the parent
 * directory is not writable by the server.
 *
 * On success, the returned array will have many indices:
 * 'path' - base directory and sub directory or full path to upload directory.
 * 'url' - base url and sub directory or absolute URL to upload directory.
 * 'subdir' - sub directory if uploads use year/month folders option is on.
 * 'basedir' - path without subdir.
 * 'baseurl' - URL path without subdir.
 * 'error' - set to false.
 *
 * @since 2.0.0
 * @uses apply_filters() Calls 'upload_dir' on returned array.
 *
 * @param string $time Optional. Time formatted in 'yyyy/mm'.
 * @return array See above for description.
 */
function wp_upload_dir( $time = null ) {
	$siteurl = get_option( 'siteurl' );
	$upload_path = get_option( 'upload_path' );
	$upload_path = trim($upload_path);
	if ( empty($upload_path) )
		$dir = WP_CONTENT_DIR . '/uploads';
	else
		$dir = $upload_path;

	// $dir is absolute, $path is (maybe) relative to ABSPATH
	$dir = path_join( ABSPATH, $dir );

	if ( !$url = get_option( 'upload_url_path' ) ) {
		if ( empty($upload_path) or ( $upload_path == $dir ) )
			$url = WP_CONTENT_URL . '/uploads';
		else
			$url = trailingslashit( $siteurl ) . $upload_path;
	}

	if ( defined('UPLOADS') ) {
		$dir = ABSPATH . UPLOADS;
		$url = trailingslashit( $siteurl ) . UPLOADS;
	}

	$bdir = $dir;
	$burl = $url;

	$subdir = '';
	if ( get_option( 'uploads_use_yearmonth_folders' ) ) {
		// Generate the yearly and monthly dirs
		if ( !$time )
			$time = current_time( 'mysql' );
		$y = substr( $time, 0, 4 );
		$m = substr( $time, 5, 2 );
		$subdir = "/$y/$m";
	}

	$dir .= $subdir;
	$url .= $subdir;

	// Make sure we have an uploads dir
	if ( ! wp_mkdir_p( $dir ) ) {
		$message = sprintf( __( 'Unable to create directory %s. Is its parent directory writable by the server?' ), $dir );
		return array( 'error' => $message );
	}

	$uploads = array( 'path' => $dir, 'url' => $url, 'subdir' => $subdir, 'basedir' => $bdir, 'baseurl' => $burl, 'error' => false );

	return apply_filters( 'upload_dir', $uploads );
}

/**
 * Get a filename that is sanitized and unique for the given directory.
 *
 * If the filename is not unique, then a number will be added to the filename
 * before the extension, and will continue adding numbers until the filename is
 * unique.
 *
 * The callback must accept two parameters, the first one is the directory and
 * the second is the filename. The callback must be a function.
 *
 * @since 2.5
 *
 * @param string $dir
 * @param string $filename
 * @param string $unique_filename_callback Function name, must be a function.
 * @return string New filename, if given wasn't unique.
 */
function wp_unique_filename( $dir, $filename, $unique_filename_callback = null ) {
	// sanitize the file name before we begin processing
	$filename = sanitize_file_name($filename);

	// separate the filename into a name and extension
	$info = pathinfo($filename);
	$ext = !empty($info['extension']) ? $info['extension'] : '';
	$name = basename($filename, ".{$ext}");
	
	// edge case: if file is named '.ext', treat as an empty name
	if( $name === ".$ext" )
		$name = '';

	// Increment the file number until we have a unique file to save in $dir. Use $override['unique_filename_callback'] if supplied.
	if ( $unique_filename_callback && function_exists( $unique_filename_callback ) ) {
		$filename = $unique_filename_callback( $dir, $name );
	} else {
		$number = '';

		if ( !empty( $ext ) )
			$ext = ".$ext";

		while ( file_exists( $dir . "/$filename" ) ) {
			if ( '' == "$number$ext" )
				$filename = $filename . ++$number . $ext;
			else
				$filename = str_replace( "$number$ext", ++$number . $ext, $filename );
		}
	}

	return $filename;
}

/**
 * Create a file in the upload folder with given content.
 *
 * If there is an error, then the key 'error' will exist with the error message.
 * If success, then the key 'file' will have the unique file path, the 'url' key
 * will have the link to the new file. and the 'error' key will be set to false.
 *
 * This function will not move an uploaded file to the upload folder. It will
 * create a new file with the content in $bits parameter. If you move the upload
 * file, read the content of the uploaded file, and then you can give the
 * filename and content to this function, which will add it to the upload
 * folder.
 *
 * The permissions will be set on the new file automatically by this function.
 *
 * @since 2.0.0
 *
 * @param string $name
 * @param null $deprecated Not used. Set to null.
 * @param mixed $bits File content
 * @param string $time Optional. Time formatted in 'yyyy/mm'.
 * @return array
 */
function wp_upload_bits( $name, $deprecated, $bits, $time = null ) {
	if ( empty( $name ) )
		return array( 'error' => __( 'Empty filename' ) );

	$wp_filetype = wp_check_filetype( $name );
	if ( !$wp_filetype['ext'] )
		return array( 'error' => __( 'Invalid file type' ) );

	$upload = wp_upload_dir( $time );

	if ( $upload['error'] !== false )
		return $upload;

	$filename = wp_unique_filename( $upload['path'], $name );

	$new_file = $upload['path'] . "/$filename";
	if ( ! wp_mkdir_p( dirname( $new_file ) ) ) {
		$message = sprintf( __( 'Unable to create directory %s. Is its parent directory writable by the server?' ), dirname( $new_file ) );
		return array( 'error' => $message );
	}

	$ifp = @ fopen( $new_file, 'wb' );
	if ( ! $ifp )
		return array( 'error' => sprintf( __( 'Could not write file %s' ), $new_file ) );

	@fwrite( $ifp, $bits );
	fclose( $ifp );
	// Set correct file permissions
	$stat = @ stat( dirname( $new_file ) );
	$perms = $stat['mode'] & 0007777;
	$perms = $perms & 0000666;
	@ chmod( $new_file, $perms );

	// Compute the URL
	$url = $upload['url'] . "/$filename";

	return array( 'file' => $new_file, 'url' => $url, 'error' => false );
}

/**
 * Retrieve the file type based on the extension name.
 *
 * @package WordPress
 * @since 2.5.0
 * @uses apply_filters() Calls 'ext2type' hook on default supported types.
 *
 * @param string $ext The extension to search.
 * @return string|null The file type, example: audio, video, document, spreadsheet, etc. Null if not found.
 */
function wp_ext2type( $ext ) {
	$ext2type = apply_filters('ext2type', array(
		'audio' => array('aac','ac3','aif','aiff','mp1','mp2','mp3','m3a','m4a','m4b','ogg','ram','wav','wma'),
		'video' => array('asf','avi','divx','dv','mov','mpg','mpeg','mp4','mpv','ogm','qt','rm','vob','wmv', 'm4v'),
		'document' => array('doc','docx','pages','odt','rtf','pdf'),
		'spreadsheet' => array('xls','xlsx','numbers','ods'),
		'interactive' => array('ppt','pptx','key','odp','swf'),
		'text' => array('txt'),
		'archive' => array('tar','bz2','gz','cab','dmg','rar','sea','sit','sqx','zip'),
		'code' => array('css','html','php','js'),
	));
	foreach ( $ext2type as $type => $exts )
		if ( in_array($ext, $exts) )
			return $type;
}

/**
 * Retrieve the file type from the file name.
 *
 * You can optionally define the mime array, if needed.
 *
 * @since 2.0.4
 *
 * @param string $filename File name or path.
 * @param array $mimes Optional. Key is the file extension with value as the mime type.
 * @return array Values with extension first and mime type.
 */
function wp_check_filetype( $filename, $mimes = null ) {
	// Accepted MIME types are set here as PCRE unless provided.
	$mimes = ( is_array( $mimes ) ) ? $mimes : apply_filters( 'upload_mimes', array(
		'jpg|jpeg|jpe' => 'image/jpeg',
		'gif' => 'image/gif',
		'png' => 'image/png',
		'bmp' => 'image/bmp',
		'tif|tiff' => 'image/tiff',
		'ico' => 'image/x-icon',
		'asf|asx|wax|wmv|wmx' => 'video/asf',
		'avi' => 'video/avi',
		'divx' => 'video/divx',
		'mov|qt' => 'video/quicktime',
		'mpeg|mpg|mpe' => 'video/mpeg',
		'txt|c|cc|h' => 'text/plain',
		'rtx' => 'text/richtext',
		'css' => 'text/css',
		'htm|html' => 'text/html',
		'mp3|m4a' => 'audio/mpeg',
		'mp4|m4v' => 'video/mp4',
		'ra|ram' => 'audio/x-realaudio',
		'wav' => 'audio/wav',
		'ogg' => 'audio/ogg',
		'mid|midi' => 'audio/midi',
		'wma' => 'audio/wma',
		'rtf' => 'application/rtf',
		'js' => 'application/javascript',
		'pdf' => 'application/pdf',
		'doc|docx' => 'application/msword',
		'pot|pps|ppt|pptx' => 'application/vnd.ms-powerpoint',
		'wri' => 'application/vnd.ms-write',
		'xla|xls|xlsx|xlt|xlw' => 'application/vnd.ms-excel',
		'mdb' => 'application/vnd.ms-access',
		'mpp' => 'application/vnd.ms-project',
		'swf' => 'application/x-shockwave-flash',
		'class' => 'application/java',
		'tar' => 'application/x-tar',
		'zip' => 'application/zip',
		'gz|gzip' => 'application/x-gzip',
		'exe' => 'application/x-msdownload',
		// openoffice formats
		'odt' => 'application/vnd.oasis.opendocument.text',
		'odp' => 'application/vnd.oasis.opendocument.presentation',
		'ods' => 'application/vnd.oasis.opendocument.spreadsheet',
		'odg' => 'application/vnd.oasis.opendocument.graphics',
		'odc' => 'application/vnd.oasis.opendocument.chart',
		'odb' => 'application/vnd.oasis.opendocument.database',
		'odf' => 'application/vnd.oasis.opendocument.formula',
		)
	);

	$type = false;
	$ext = false;

	foreach ( $mimes as $ext_preg => $mime_match ) {
		$ext_preg = '!\.(' . $ext_preg . ')$!i';
		if ( preg_match( $ext_preg, $filename, $ext_matches ) ) {
			$type = $mime_match;
			$ext = $ext_matches[1];
			break;
		}
	}

	return compact( 'ext', 'type' );
}

/**
 * Retrieve nonce action "Are you sure" message.
 *
 * The action is split by verb and noun. The action format is as follows:
 * verb-action_extra. The verb is before the first dash and has the format of
 * letters and no spaces and numbers. The noun is after the dash and before the
 * underscore, if an underscore exists. The noun is also only letters.
 *
 * The filter will be called for any action, which is not defined by WordPress.
 * You may use the filter for your plugin to explain nonce actions to the user,
 * when they get the "Are you sure?" message. The filter is in the format of
 * 'explain_nonce_$verb-$noun' with the $verb replaced by the found verb and the
 * $noun replaced by the found noun. The two parameters that are given to the
 * hook are the localized "Are you sure you want to do this?" message with the
 * extra text (the text after the underscore).
 *
 * @package WordPress
 * @subpackage Security
 * @since 2.0.4
 *
 * @param string $action Nonce action.
 * @return string Are you sure message.
 */
function wp_explain_nonce( $action ) {
	if ( $action !== -1 && preg_match( '/([a-z]+)-([a-z]+)(_(.+))?/', $action, $matches ) ) {
		$verb = $matches[1];
		$noun = $matches[2];

		$trans = array();
		$trans['update']['attachment'] = array( __( 'Your attempt to edit this attachment: &#8220;%s&#8221; has failed.' ), 'get_the_title' );

		$trans['add']['category']      = array( __( 'Your attempt to add this category has failed.' ), false );
		$trans['delete']['category']   = array( __( 'Your attempt to delete this category: &#8220;%s&#8221; has failed.' ), 'get_cat_name' );
		$trans['update']['category']   = array( __( 'Your attempt to edit this category: &#8220;%s&#8221; has failed.' ), 'get_cat_name' );

		$trans['delete']['comment']    = array( __( 'Your attempt to delete this comment: &#8220;%s&#8221; has failed.' ), 'use_id' );
		$trans['unapprove']['comment'] = array( __( 'Your attempt to unapprove this comment: &#8220;%s&#8221; has failed.' ), 'use_id' );
		$trans['approve']['comment']   = array( __( 'Your attempt to approve this comment: &#8220;%s&#8221; has failed.' ), 'use_id' );
		$trans['update']['comment']    = array( __( 'Your attempt to edit this comment: &#8220;%s&#8221; has failed.' ), 'use_id' );
		$trans['bulk']['comments']     = array( __( 'Your attempt to bulk modify comments has failed.' ), false );
		$trans['moderate']['comments'] = array( __( 'Your attempt to moderate comments has failed.' ), false );

		$trans['add']['bookmark']      = array( __( 'Your attempt to add this link has failed.' ), false );
		$trans['delete']['bookmark']   = array( __( 'Your attempt to delete this link: &#8220;%s&#8221; has failed.' ), 'use_id' );
		$trans['update']['bookmark']   = array( __( 'Your attempt to edit this link: &#8220;%s&#8221; has failed.' ), 'use_id' );
		$trans['bulk']['bookmarks']    = array( __( 'Your attempt to bulk modify links has failed.' ), false );

		$trans['add']['page']          = array( __( 'Your attempt to add this page has failed.' ), false );
		$trans['delete']['page']       = array( __( 'Your attempt to delete this page: &#8220;%s&#8221; has failed.' ), 'get_the_title' );
		$trans['update']['page']       = array( __( 'Your attempt to edit this page: &#8220;%s&#8221; has failed.' ), 'get_the_title' );

		$trans['edit']['plugin']       = array( __( 'Your attempt to edit this plugin file: &#8220;%s&#8221; has failed.' ), 'use_id' );
		$trans['activate']['plugin']   = array( __( 'Your attempt to activate this plugin: &#8220;%s&#8221; has failed.' ), 'use_id' );
		$trans['deactivate']['plugin'] = array( __( 'Your attempt to deactivate this plugin: &#8220;%s&#8221; has failed.' ), 'use_id' );
		$trans['upgrade']['plugin']    = array( __( 'Your attempt to upgrade this plugin: &#8220;%s&#8221; has failed.' ), 'use_id' );

		$trans['add']['post']          = array( __( 'Your attempt to add this post has failed.' ), false );
		$trans['delete']['post']       = array( __( 'Your attempt to delete this post: &#8220;%s&#8221; has failed.' ), 'get_the_title' );
		$trans['update']['post']       = array( __( 'Your attempt to edit this post: &#8220;%s&#8221; has failed.' ), 'get_the_title' );

		$trans['add']['user']          = array( __( 'Your attempt to add this user has failed.' ), false );
		$trans['delete']['users']      = array( __( 'Your attempt to delete users has failed.' ), false );
		$trans['bulk']['users']        = array( __( 'Your attempt to bulk modify users has failed.' ), false );
		$trans['update']['user']       = array( __( 'Your attempt to edit this user: &#8220;%s&#8221; has failed.' ), 'get_author_name' );
		$trans['update']['profile']    = array( __( 'Your attempt to modify the profile for: &#8220;%s&#8221; has failed.' ), 'get_author_name' );

		$trans['update']['options']    = array( __( 'Your attempt to edit your settings has failed.' ), false );
		$trans['update']['permalink']  = array( __( 'Your attempt to change your permalink structure to: %s has failed.' ), 'use_id' );
		$trans['edit']['file']         = array( __( 'Your attempt to edit this file: &#8220;%s&#8221; has failed.' ), 'use_id' );
		$trans['edit']['theme']        = array( __( 'Your attempt to edit this theme file: &#8220;%s&#8221; has failed.' ), 'use_id' );
		$trans['switch']['theme']      = array( __( 'Your attempt to switch to this theme: &#8220;%s&#8221; has failed.' ), 'use_id' );

		$trans['log']['out']           = array( sprintf( __( 'You are attempting to log out of %s' ), get_bloginfo( 'sitename' ) ), false );

		if ( isset( $trans[$verb][$noun] ) ) {
			if ( !empty( $trans[$verb][$noun][1] ) ) {
				$lookup = $trans[$verb][$noun][1];
				$object = $matches[4];
				if ( 'use_id' != $lookup )
					$object = call_user_func( $lookup, $object );
				return sprintf( $trans[$verb][$noun][0], wp_specialchars($object) );
			} else {
				return $trans[$verb][$noun][0];
			}
		}

		return apply_filters( 'explain_nonce_' . $verb . '-' . $noun, __( 'Are you sure you want to do this?' ), $matches[4] );
	} else {
		return apply_filters( 'explain_nonce_' . $action, __( 'Are you sure you want to do this?' ) );
	}
}

/**
 * Display "Are You Sure" message to confirm the action being taken.
 *
 * If the action has the nonce explain message, then it will be displayed along
 * with the "Are you sure?" message.
 *
 * @package WordPress
 * @subpackage Security
 * @since 2.0.4
 *
 * @param string $action The nonce action.
 */
function wp_nonce_ays( $action ) {
	$title = __( 'WordPress Failure Notice' );
	$html = wp_specialchars( wp_explain_nonce( $action ) );
	if ( wp_get_referer() )
		$html .= "</p><p><a href='" . clean_url( remove_query_arg( 'updated', wp_get_referer() ) ) . "'>" . __( 'Please try again.' ) . "</a>";
	elseif ( 'log-out' == $action )
		$html .= "</p><p>" . sprintf( __( "Do you really want to <a href='%s'>log out</a>?"), wp_logout_url() );

	wp_die( $html, $title);
}

/**
 * Kill WordPress execution and display HTML message with error message.
 *
 * Call this function complements the die() PHP function. The difference is that
 * HTML will be displayed to the user. It is recommended to use this function
 * only, when the execution should not continue any further. It is not
 * recommended to call this function very often and try to handle as many errors
 * as possible siliently.
 *
 * @since 2.0.4
 *
 * @param string $message Error message.
 * @param string $title Error title.
 * @param string|array $args Optional arguements to control behaviour.
 */
function wp_die( $message, $title = '', $args = array() ) {
	global $wp_locale;

	$defaults = array( 'response' => 500 );
	$r = wp_parse_args($args, $defaults);

	if ( function_exists( 'is_wp_error' ) && is_wp_error( $message ) ) {
		if ( empty( $title ) ) {
			$error_data = $message->get_error_data();
			if ( is_array( $error_data ) && isset( $error_data['title'] ) )
				$title = $error_data['title'];
		}
		$errors = $message->get_error_messages();
		switch ( count( $errors ) ) :
		case 0 :
			$message = '';
			break;
		case 1 :
			$message = "<p>{$errors[0]}</p>";
			break;
		default :
			$message = "<ul>\n\t\t<li>" . join( "</li>\n\t\t<li>", $errors ) . "</li>\n\t</ul>";
			break;
		endswitch;
	} elseif ( is_string( $message ) ) {
		$message = "<p>$message</p>";
	}

	if ( defined( 'WP_SITEURL' ) && '' != WP_SITEURL )
		$admin_dir = WP_SITEURL . '/wp-admin/';
	elseif ( function_exists( 'get_bloginfo' ) && '' != get_bloginfo( 'wpurl' ) )
		$admin_dir = get_bloginfo( 'wpurl' ) . '/wp-admin/';
	elseif ( strpos( $_SERVER['PHP_SELF'], 'wp-admin' ) !== false )
		$admin_dir = '';
	else
		$admin_dir = 'wp-admin/';

	if ( !function_exists( 'did_action' ) || !did_action( 'admin_head' ) ) :
	if( !headers_sent() ){
		status_header( $r['response'] );
		nocache_headers();
		header( 'Content-Type: text/html; charset=utf-8' );
	}

	if ( empty($title) ) {
		if ( function_exists( '__' ) )
			$title = __( 'WordPress &rsaquo; Error' );
		else
			$title = 'WordPress &rsaquo; Error';
	}

?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" <?php if ( function_exists( 'language_attributes' ) ) language_attributes(); ?>>
<head>
	<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
	<title><?php echo $title ?></title>
	<link rel="stylesheet" href="<?php echo $admin_dir; ?>css/install.css" type="text/css" />
<?php
if ( ( $wp_locale ) && ( 'rtl' == $wp_locale->text_direction ) ) : ?>
	<link rel="stylesheet" href="<?php echo $admin_dir; ?>css/install-rtl.css" type="text/css" />
<?php endif; ?>
</head>
<body id="error-page">
<?php endif; ?>
	<?php echo $message; ?>
	<?php if ( strlen($message) < 512) echo str_repeat(' ', 512-strlen($message)); ?>
</body>
</html>
<?php
	die();
}

/**
 * Retrieve the WordPress home page URL.
 *
 * If the constant named 'WP_HOME' exists, then it willl be used and returned by
 * the function. This can be used to counter the redirection on your local
 * development environment.
 *
 * @access private
 * @package WordPress
 * @since 2.2.0
 *
 * @param string $url URL for the home location
 * @return string Homepage location.
 */
function _config_wp_home( $url = '' ) {
	if ( defined( 'WP_HOME' ) )
		return WP_HOME;
	return $url;
}

/**
 * Retrieve the WordPress site URL.
 *
 * If the constant named 'WP_SITEURL' is defined, then the value in that
 * constant will always be returned. This can be used for debugging a site on
 * your localhost while not having to change the database to your URL.
 *
 * @access private
 * @package WordPress
 * @since 2.2.0
 *
 * @param string $url URL to set the WordPress site location.
 * @return string The WordPress Site URL
 */
function _config_wp_siteurl( $url = '' ) {
	if ( defined( 'WP_SITEURL' ) )
		return WP_SITEURL;
	return $url;
}

/**
 * Set the localized direction for MCE plugin.
 *
 * Will only set the direction to 'rtl', if the WordPress locale has the text
 * direction set to 'rtl'.
 *
 * Fills in the 'directionality', 'plugins', and 'theme_advanced_button1' array
 * keys. These keys are then returned in the $input array.
 *
 * @access private
 * @package WordPress
 * @subpackage MCE
 * @since 2.1.0
 *
 * @param array $input MCE plugin array.
 * @return array Direction set for 'rtl', if needed by locale.
 */
function _mce_set_direction( $input ) {
	global $wp_locale;

	if ( 'rtl' == $wp_locale->text_direction ) {
		$input['directionality'] = 'rtl';
		$input['plugins'] .= ',directionality';
		$input['theme_advanced_buttons1'] .= ',ltr';
	}

	return $input;
}


/**
 * Convert smiley code to the icon graphic file equivalent.
 *
 * You can turn off smilies, by going to the write setting screen and unchecking
 * the box, or by setting 'use_smilies' option to false or removing the option.
 *
 * Plugins may override the default smiley list by setting the $wpsmiliestrans
 * to an array, with the key the code the blogger types in and the value the
 * image file.
 *
 * The $wp_smiliessearch global is for the regular expression and is set each
 * time the function is called.
 *
 * The full list of smilies can be found in the function and won't be listed in
 * the description. Probably should create a Codex page for it, so that it is
 * available.
 *
 * @global array $wpsmiliestrans
 * @global array $wp_smiliessearch
 * @since 2.2.0
 */
function smilies_init() {
	global $wpsmiliestrans, $wp_smiliessearch;

	// don't bother setting up smilies if they are disabled
	if ( !get_option( 'use_smilies' ) )
		return;

	if ( !isset( $wpsmiliestrans ) ) {
		$wpsmiliestrans = array(
		':mrgreen:' => 'icon_mrgreen.gif',
		':neutral:' => 'icon_neutral.gif',
		':twisted:' => 'icon_twisted.gif',
		  ':arrow:' => 'icon_arrow.gif',
		  ':shock:' => 'icon_eek.gif',
		  ':smile:' => 'icon_smile.gif',
		    ':???:' => 'icon_confused.gif',
		   ':cool:' => 'icon_cool.gif',
		   ':evil:' => 'icon_evil.gif',
		   ':grin:' => 'icon_biggrin.gif',
		   ':idea:' => 'icon_idea.gif',
		   ':oops:' => 'icon_redface.gif',
		   ':razz:' => 'icon_razz.gif',
		   ':roll:' => 'icon_rolleyes.gif',
		   ':wink:' => 'icon_wink.gif',
		    ':cry:' => 'icon_cry.gif',
		    ':eek:' => 'icon_surprised.gif',
		    ':lol:' => 'icon_lol.gif',
		    ':mad:' => 'icon_mad.gif',
		    ':sad:' => 'icon_sad.gif',
		      '8-)' => 'icon_cool.gif',
		      '8-O' => 'icon_eek.gif',
		      ':-(' => 'icon_sad.gif',
		      ':-)' => 'icon_smile.gif',
		      ':-?' => 'icon_confused.gif',
		      ':-D' => 'icon_biggrin.gif',
		      ':-P' => 'icon_razz.gif',
		      ':-o' => 'icon_surprised.gif',
		      ':-x' => 'icon_mad.gif',
		      ':-|' => 'icon_neutral.gif',
		      ';-)' => 'icon_wink.gif',
		       '8)' => 'icon_cool.gif',
		       '8O' => 'icon_eek.gif',
		       ':(' => 'icon_sad.gif',
		       ':)' => 'icon_smile.gif',
		       ':?' => 'icon_confused.gif',
		       ':D' => 'icon_biggrin.gif',
		       ':P' => 'icon_razz.gif',
		       ':o' => 'icon_surprised.gif',
		       ':x' => 'icon_mad.gif',
		       ':|' => 'icon_neutral.gif',
		       ';)' => 'icon_wink.gif',
		      ':!:' => 'icon_exclaim.gif',
		      ':?:' => 'icon_question.gif',
		);
	}

	if (count($wpsmiliestrans) == 0) {
		return;
	}

	/*
	 * NOTE: we sort the smilies in reverse key order. This is to make sure
	 * we match the longest possible smilie (:???: vs :?) as the regular
	 * expression used below is first-match
	 */
	krsort($wpsmiliestrans);

	$wp_smiliessearch = '/(?:\s|^)';

	$subchar = '';
	foreach ( (array) $wpsmiliestrans as $smiley => $img ) {
		$firstchar = substr($smiley, 0, 1);
		$rest = substr($smiley, 1);

		// new subpattern?
		if ($firstchar != $subchar) {
			if ($subchar != '') {
				$wp_smiliessearch .= ')|(?:\s|^)';
			}
			$subchar = $firstchar;
			$wp_smiliessearch .= preg_quote($firstchar, '/') . '(?:';
		} else {
			$wp_smiliessearch .= '|';
		}
		$wp_smiliessearch .= preg_quote($rest);
	}

	$wp_smiliessearch .= ')(?:\s|$)/m';
}

/**
 * Merge user defined arguments into defaults array.
 *
 * This function is used throughout WordPress to allow for both string or array
 * to be merged into another array.
 *
 * @since 2.2.0
 *
 * @param string|array $args Value to merge with $defaults
 * @param array $defaults Array that serves as the defaults.
 * @return array Merged user defined values with defaults.
 */
function wp_parse_args( $args, $defaults = '' ) {
	if ( is_object( $args ) )
		$r = get_object_vars( $args );
	elseif ( is_array( $args ) )
		$r =& $args;
	else
		wp_parse_str( $args, $r );

	if ( is_array( $defaults ) )
		return array_merge( $defaults, $r );
	return $r;
}

/**
 * Determines if Widgets library should be loaded.
 *
 * Checks to make sure that the widgets library hasn't already been loaded. If
 * it hasn't, then it will load the widgets library and run an action hook.
 *
 * @since 2.2.0
 * @uses add_action() Calls '_admin_menu' hook with 'wp_widgets_add_menu' value.
 */
function wp_maybe_load_widgets() {
	if ( ! apply_filters('load_default_widgets', true) )
		return;
	require_once( ABSPATH . WPINC . '/default-widgets.php' );
	add_action( '_admin_menu', 'wp_widgets_add_menu' );
}

/**
 * Append the Widgets menu to the themes main menu.
 *
 * @since 2.2.0
 * @uses $submenu The administration submenu list.
 */
function wp_widgets_add_menu() {
	global $submenu;
	$submenu['themes.php'][7] = array( __( 'Widgets' ), 'switch_themes', 'widgets.php' );
	ksort( $submenu['themes.php'], SORT_NUMERIC );
}

/**
 * Flush all output buffers for PHP 5.2.
 *
 * Make sure all output buffers are flushed before our singletons our destroyed.
 *
 * @since 2.2.0
 */
function wp_ob_end_flush_all() {
	$levels = ob_get_level(); 
	for ($i=0; $i<$levels; $i++) 
		ob_end_flush(); 
}

/**
 * Load the correct database class file.
 *
 * This function is used to load the database class file either at runtime or by
 * wp-admin/setup-config.php We must globalise $wpdb to ensure that it is
 * defined globally by the inline code in wp-db.php.
 *
 * @since 2.5.0
 * @global $wpdb WordPress Database Object
 */
function require_wp_db() {
	global $wpdb;
	if ( file_exists( WP_CONTENT_DIR . '/db.php' ) )
		require_once( WP_CONTENT_DIR . '/db.php' );
	else
		require_once( ABSPATH . WPINC . '/wp-db.php' );
}

/**
 * Load custom DB error or display WordPress DB error.
 *
 * If a file exists in the wp-content directory named db-error.php, then it will
 * be loaded instead of displaying the WordPress DB error. If it is not found,
 * then the WordPress DB error will be displayed instead.
 *
 * The WordPress DB error sets the HTTP status header to 500 to try to prevent
 * search engines from caching the message. Custom DB messages should do the
 * same.
 *
 * This function was backported to the the WordPress 2.3.2, but originally was
 * added in WordPress 2.5.0.
 *
 * @since 2.3.2
 * @uses $wpdb
 */
function dead_db() {
	global $wpdb;

	// Load custom DB error template, if present.
	if ( file_exists( WP_CONTENT_DIR . '/db-error.php' ) ) {
		require_once( WP_CONTENT_DIR . '/db-error.php' );
		die();
	}

	// If installing or in the admin, provide the verbose message.
	if ( defined('WP_INSTALLING') || defined('WP_ADMIN') )
		wp_die($wpdb->error);

	// Otherwise, be terse.
	status_header( 500 );
	nocache_headers();
	header( 'Content-Type: text/html; charset=utf-8' );
?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" <?php if ( function_exists( 'language_attributes' ) ) language_attributes(); ?>>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
	<title>Database Error</title>

</head>
<body>
	<h1>Error establishing a database connection</h1>
</body>
</html>
<?php
	die();
}

/**
 * Converts value to nonnegative integer.
 *
 * @since 2.5.0
 *
 * @param mixed $maybeint Data you wish to have convered to an nonnegative integer
 * @return int An nonnegative integer
 */
function absint( $maybeint ) {
	return abs( intval( $maybeint ) );
}

/**
 * Determines if the blog can be accessed over SSL.
 *
 * Determines if blog can be accessed over SSL by using cURL to access the site
 * using the https in the siteurl. Requires cURL extension to work correctly.
 *
 * @since 2.5.0
 *
 * @return bool Whether or not SSL access is available
 */
function url_is_accessable_via_ssl($url)
{
	if (in_array('curl', get_loaded_extensions())) {
		$ssl = preg_replace( '/^http:\/\//', 'https://',  $url );

		$ch = curl_init();
		curl_setopt($ch, CURLOPT_URL, $ssl);
		curl_setopt($ch, CURLOPT_FAILONERROR, true);
		curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
		curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
		curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 5);

		curl_exec($ch);

		$status = curl_getinfo($ch, CURLINFO_HTTP_CODE);
		curl_close ($ch);

		if ($status == 200 || $status == 401) {
			return true;
		}
	}
	return false;
}

/**
 * Secure URL, if available or the given URL.
 *
 * @since 2.5.0
 *
 * @param string $url Complete URL path with transport.
 * @return string Secure or regular URL path.
 */
function atom_service_url_filter($url)
{
	if ( url_is_accessable_via_ssl($url) )
		return preg_replace( '/^http:\/\//', 'https://',  $url );
	else
		return $url;
}

/**
 * Marks a function as deprecated and informs when it has been used.
 *
 * There is a hook deprecated_function_run that will be called that can be used
 * to get the backtrace up to what file and function called the deprecated
 * function.
 *
 * The current behavior is to trigger an user error if WP_DEBUG is defined and
 * is true.
 *
 * This function is to be used in every function in depreceated.php
 *
 * @package WordPress
 * @package Debug
 * @since 2.5.0
 * @access private
 *
 * @uses do_action() Calls 'deprecated_function_run' and passes the function name and what to use instead.
 * @uses apply_filters() Calls 'deprecated_function_trigger_error' and expects boolean value of true to do trigger or false to not trigger error.
 *
 * @param string $function The function that was called
 * @param string $version The version of WordPress that deprecated the function
 * @param string $replacement Optional. The function that should have been called
 */
function _deprecated_function($function, $version, $replacement=null) {

	do_action('deprecated_function_run', $function, $replacement);

	// Allow plugin to filter the output error trigger
	if( defined('WP_DEBUG') && ( true === WP_DEBUG ) && apply_filters( 'deprecated_function_trigger_error', true )) {
		if( !is_null($replacement) )
			trigger_error( sprintf( __('%1$s is <strong>deprecated</strong> since version %2$s! Use %3$s instead.'), $function, $version, $replacement ) );
		else
			trigger_error( sprintf( __('%1$s is <strong>deprecated</strong> since version %2$s with no alternative available.'), $function, $version ) );
	}
}

/**
 * Marks a file as deprecated and informs when it has been used.
 *
 * There is a hook deprecated_file_included that will be called that can be used
 * to get the backtrace up to what file and function included the deprecated
 * file.
 *
 * The current behavior is to trigger an user error if WP_DEBUG is defined and
 * is true.
 *
 * This function is to be used in every file that is depreceated
 *
 * @package WordPress
 * @package Debug
 * @since 2.5.0
 * @access private
 *
 * @uses do_action() Calls 'deprecated_file_included' and passes the file name and what to use instead.
 * @uses apply_filters() Calls 'deprecated_file_trigger_error' and expects boolean value of true to do trigger or false to not trigger error.
 *
 * @param string $file The file that was included
 * @param string $version The version of WordPress that deprecated the function
 * @param string $replacement Optional. The function that should have been called
 */
function _deprecated_file($file, $version, $replacement=null) {

	do_action('deprecated_file_included', $file, $replacement);

	// Allow plugin to filter the output error trigger
	if( defined('WP_DEBUG') && ( true === WP_DEBUG ) && apply_filters( 'deprecated_file_trigger_error', true )) {
		if( !is_null($replacement) )
			trigger_error( sprintf( __('%1$s is <strong>deprecated</strong> since version %2$s! Use %3$s instead.'), $file, $version, $replacement ) );
		else
			trigger_error( sprintf( __('%1$s is <strong>deprecated</strong> since version %2$s with no alternative available.'), $file, $version ) );
	}
}

/**
 * Is the server running earlier than 1.5.0 version of lighttpd
 *
 * @since 2.5.0
 *
 * @return bool Whether the server is running lighttpd < 1.5.0
 */
function is_lighttpd_before_150() {
	$server_parts = explode( '/', isset( $_SERVER['SERVER_SOFTWARE'] )? $_SERVER['SERVER_SOFTWARE'] : '' );
	$server_parts[1] = isset( $server_parts[1] )? $server_parts[1] : '';
	return  'lighttpd' == $server_parts[0] && -1 == version_compare( $server_parts[1], '1.5.0' );
}

/**
 * Does the specified module exist in the apache config?
 *
 * @since 2.5.0
 *
 * @param string $mod e.g. mod_rewrite
 * @param bool $default The default return value if the module is not found
 * @return bool
 */
function apache_mod_loaded($mod, $default = false) {
	global $is_apache;

	if ( !$is_apache )
		return false;

	if ( function_exists('apache_get_modules') ) {
		$mods = apache_get_modules();
		if ( in_array($mod, $mods) )
			return true;
	} elseif ( function_exists('phpinfo') ) {
			ob_start();
			phpinfo(8);
			$phpinfo = ob_get_clean();
			if ( false !== strpos($phpinfo, $mod) )
				return true;
	}
	return $default;
}

/**
 * File validates against allowed set of defined rules.
 *
 * A return value of '1' means that the $file contains either '..' or './'. A
 * return value of '2' means that the $file contains ':' after the first
 * character. A return value of '3' means that the file is not in the allowed
 * files list.
 *
 * @since 1.2.0
 *
 * @param string $file File path.
 * @param array $allowed_files List of allowed files.
 * @return int 0 means nothing is wrong, greater than 0 means something was wrong.
 */
function validate_file( $file, $allowed_files = '' ) {
	if ( false !== strpos( $file, '..' ))
		return 1;

	if ( false !== strpos( $file, './' ))
		return 1;

	if (':' == substr( $file, 1, 1 ))
		return 2;

	if (!empty ( $allowed_files ) && (!in_array( $file, $allowed_files ) ) )
		return 3;

	return 0;
}

/**
 * Determine if SSL is used.
 *
 * @since 2.6.0
 *
 * @return bool True if SSL, false if not used.
 */
function is_ssl() {
	if ( isset($_SERVER['HTTPS']) ) {
		if ( 'on' == strtolower($_SERVER['HTTPS']) )
			return true;
		if ( '1' == $_SERVER['HTTPS'] )
			return true;
	} elseif ( isset($_SERVER['SERVER_PORT']) && ( '443' == $_SERVER['SERVER_PORT'] ) ) {
		return true;
	}
	return false;
}

/**
 * Whether SSL login should be forced.
 *
 * @since 2.6.0
 *
 * @param string|bool $force Optional.
 * @return bool True if forced, false if not forced.
 */
function force_ssl_login($force = '') {
	static $forced;

	if ( '' != $force ) {
		$old_forced = $forced;
		$forced = $force;
		return $old_forced;
	}

	return $forced;
}

/**
 * Whether to force SSL used for the Administration Panels.
 *
 * @since 2.6.0
 *
 * @param string|bool $force
 * @return bool True if forced, false if not forced.
 */
function force_ssl_admin($force = '') {
	static $forced;

	if ( '' != $force ) {
		$old_forced = $forced;
		$forced = $force;
		return $old_forced;
	}

	return $forced;
}

/**
 * Guess the URL for the site.
 *
 * Will remove wp-admin links to retrieve only return URLs not in the wp-admin
 * directory.
 *
 * @since 2.6.0
 *
 * @return string
 */
function wp_guess_url() {
	if ( defined('WP_SITEURL') && '' != WP_SITEURL ) {
		$url = WP_SITEURL;
	} else {
		$schema = ( isset($_SERVER['HTTPS']) && strtolower($_SERVER['HTTPS']) == 'on' ) ? 'https://' : 'http://';
		$url = preg_replace('|/wp-admin/.*|i', '', $schema . $_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI']);
	}
	return $url;
}

/**
 * Suspend cache invalidation.
 *
 * Turns cache invalidation on and off.  Useful during imports where you don't wont to do invalidations
 * every time a post is inserted.  Callers must be sure that what they are doing won't lead to an inconsistent
 * cache when invalidation is suspended.
 *
 * @since 2.7.0
 *
 * @param bool $suspend Whether to suspend or enable cache invalidation
 * @return bool The current suspend setting
 */
function wp_suspend_cache_invalidation($suspend = true) {
	global $_wp_suspend_cache_invalidation;

	$current_suspend = $_wp_suspend_cache_invalidation;
	$_wp_suspend_cache_invalidation = $suspend;
	return $current_suspend;
}

function get_site_option( $key, $default = false, $use_cache = true ) {
	return get_option($key, $default);
}

// expects $key, $value not to be SQL escaped
function add_site_option( $key, $value ) {
	return add_option($key, $value);
}

// expects $key, $value not to be SQL escaped
function update_site_option( $key, $value ) {
	return update_option($key, $value);
}

/**
 * gmt_offset modification for smart timezone handling
 *
 * Overrides the gmt_offset option if we have a timezone_string available
 */
function wp_timezone_override_offset() {
	if (!wp_timezone_supported()) return false;

	$tz = get_option('timezone_string');
	if (empty($tz)) return false;

	@date_default_timezone_set($tz);

	$dateTimeZoneSelected = timezone_open($tz);
	$dateTimeServer = date_create();
	if ($dateTimeZoneSelected === false || $dateTimeServer === false) return false;

	$timeOffset = timezone_offset_get($dateTimeZoneSelected, $dateTimeServer);
	$timeOffset = $timeOffset / 3600;

	return $timeOffset;
}

/**
 * Check for PHP timezone support
 *
 */
function wp_timezone_supported() {
	if (function_exists('date_default_timezone_set')
		&& function_exists('timezone_identifiers_list')
		&& function_exists('timezone_open')
		&& function_exists('timezone_offset_get')
		)
		return true;

	return false;
}

/**
 * Gives a nicely formatted list of timezone strings // temporary! Not in final
 *
 * @param string $selectedzone - which zone should be the selected one
 *
 */
function wp_timezone_choice($selectedzone) {
	$continents = array('Africa', 'America', 'Antarctica', 'Arctic', 'Asia', 'Atlantic', 'Australia', 'Europe', 'Indian', 'Pacific', 'Etc');

	$all = timezone_identifiers_list();

	$i = 0;
	foreach ( $all as $zone ) {
		$zone = explode('/',$zone);
		if ( ! in_array($zone[0], $continents) )
			continue;
		$zonen[$i]['continent'] = isset($zone[0]) ? $zone[0] : '';
		$zonen[$i]['city'] = isset($zone[1]) ? $zone[1] : '';
		$zonen[$i]['subcity'] = isset($zone[2]) ? $zone[2] : '';
		$i++;
	}

	usort($zonen, create_function(
		'$a, $b', '
		if ( $a["continent"] == $b["continent"] && $a["city"] == $b["city"] )
			return strnatcasecmp($a["subcity"], $b["subcity"]);
		elseif ( $a["continent"] == $b["continent"] )
			return strnatcasecmp($a["city"], $b["city"]);
		else
			return strnatcasecmp($a["continent"], $b["continent"]);
		'));
	
	$structure = '';
	$pad = '&nbsp;&nbsp;&nbsp;';

	if ( empty($selectedzone) )
		$structure .= '<option selected="selected" value="">' . __('Select a city') . "</option>\n";
	foreach ( $zonen as $zone ) {
		extract($zone);
		if ( empty($selectcontinent) && !empty($city) ) {
			$selectcontinent = $continent;
			$structure .= '<optgroup label="'.$continent.'">' . "\n"; // continent
		} elseif ( !empty($selectcontinent) && $selectcontinent != $continent ) {
			$structure .= "</optgroup>\n";
			$selectcontinent = '';
			if ( !empty($city) ) {
				$selectcontinent = $continent;
				$structure .= '<optgroup label="'.$continent.'">' . "\n"; // continent
			}
		}

		if ( !empty($city) ) {
			if ( !empty($subcity) ) {
				$city = $city . '/'. $subcity;
			}
			$display = str_replace('_',' ',$city);
			if ( $continent == 'Etc' )
				$display = strtr($display, '+-', '-+');
			$structure .= "\t<option ".((($continent.'/'.$city)==$selectedzone)?'selected="selected"':'')." value=\"".($continent.'/'.$city)."\">$pad".$display."</option>\n"; //Timezone
		} else {
			$structure .= "<option ".(($continent==$selectedzone)?'selected="selected"':'')." value=\"".$continent."\">".$continent."</option>\n"; //Timezone
		}
	}

	if ( !empty($selectcontinent) )
		$structure .= "</optgroup>\n";
	return $structure;
}



/**
 * Strip close comment and close php tags from file headers used by WP
 * See http://core.trac.wordpress.org/ticket/8497
 *
 * @since 2.8
**/
function _cleanup_header_comment($str) {
	return trim(preg_replace("/\s*(?:\*\/|\?>).*/", '', $str));
}
?>