WordPress/wp-includes/compat.php

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<?php
/**
* WordPress implementation for PHP functions missing from older PHP versions.
*
* @package PHP
* @access private
*/
// Added in PHP 5.0
if (!function_exists('http_build_query')) {
function http_build_query($data, $prefix=null, $sep=null) {
return _http_build_query($data, $prefix, $sep);
}
}
// from php.net (modified by Mark Jaquith to behave like the native PHP5 function)
function _http_build_query($data, $prefix=null, $sep=null, $key='', $urlencode=true) {
$ret = array();
foreach ( (array) $data as $k => $v ) {
if ( $urlencode)
$k = urlencode($k);
if ( is_int($k) && $prefix != null )
$k = $prefix.$k;
if ( !empty($key) )
$k = $key . '%5B' . $k . '%5D';
if ( $v === NULL )
continue;
elseif ( $v === FALSE )
$v = '0';
if ( is_array($v) || is_object($v) )
array_push($ret,_http_build_query($v, '', $sep, $k, $urlencode));
elseif ( $urlencode )
array_push($ret, $k.'='.urlencode($v));
else
array_push($ret, $k.'='.$v);
}
if ( NULL === $sep )
$sep = ini_get('arg_separator.output');
return implode($sep, $ret);
}
if ( !function_exists('_') ) {
function _($string) {
return $string;
}
}
if (!function_exists('stripos')) {
function stripos($haystack, $needle, $offset = 0) {
return strpos(strtolower($haystack), strtolower($needle), $offset);
}
}
if ( !function_exists('hash_hmac') ):
function hash_hmac($algo, $data, $key, $raw_output = false) {
return _hash_hmac($algo, $data, $key, $raw_output);
}
endif;
function _hash_hmac($algo, $data, $key, $raw_output = false) {
$packs = array('md5' => 'H32', 'sha1' => 'H40');
if ( !isset($packs[$algo]) )
return false;
$pack = $packs[$algo];
if (strlen($key) > 64)
$key = pack($pack, $algo($key));
$key = str_pad($key, 64, chr(0));
$ipad = (substr($key, 0, 64) ^ str_repeat(chr(0x36), 64));
$opad = (substr($key, 0, 64) ^ str_repeat(chr(0x5C), 64));
$hmac = $algo($opad . pack($pack, $algo($ipad . $data)));
if ( $raw_output )
return pack( $pack, $hmac );
return $hmac;
}
if ( !function_exists('mb_substr') ):
function mb_substr( $str, $start, $length=null, $encoding=null ) {
return _mb_substr($str, $start, $length, $encoding);
}
endif;
function _mb_substr( $str, $start, $length=null, $encoding=null ) {
// the solution below, works only for utf-8, so in case of a different
// charset, just use built-in substr
$charset = get_option( 'blog_charset' );
if ( !in_array( $charset, array('utf8', 'utf-8', 'UTF8', 'UTF-8') ) ) {
return is_null( $length )? substr( $str, $start ) : substr( $str, $start, $length);
}
// use the regex unicode support to separate the UTF-8 characters into an array
preg_match_all( '/./us', $str, $match );
$chars = is_null( $length )? array_slice( $match[0], $start ) : array_slice( $match[0], $start, $length );
return implode( '', $chars );
}
if ( !function_exists( 'htmlspecialchars_decode' ) ) {
// Added in PHP 5.1.0
// Error checks from PEAR::PHP_Compat
function htmlspecialchars_decode( $string, $quote_style = ENT_COMPAT )
{
if ( !is_scalar( $string ) ) {
trigger_error( 'htmlspecialchars_decode() expects parameter 1 to be string, ' . gettype( $string ) . ' given', E_USER_WARNING );
return;
}
if ( !is_int( $quote_style ) && $quote_style !== null ) {
trigger_error( 'htmlspecialchars_decode() expects parameter 2 to be integer, ' . gettype( $quote_style ) . ' given', E_USER_WARNING );
return;
}
return wp_specialchars_decode( $string, $quote_style );
}
}
// For PHP < 5.2.0
if ( !function_exists('json_encode') ) {
function json_encode( $string ) {
global $wp_json;
if ( !is_a($wp_json, 'Services_JSON') ) {
require_once( 'class-json.php' );
$wp_json = new Services_JSON();
}
return $wp_json->encode( $string );
}
}
if ( !function_exists('json_decode') ) {
function json_decode( $string ) {
global $wp_json;
if ( !is_a($wp_json, 'Services_JSON') ) {
require_once( 'class-json.php' );
$wp_json = new Services_JSON();
}
return $wp_json->decode( $string );
}
}
// pathinfo that fills 'filename' without extension like in PHP 5.2+
function pathinfo52($path) {
$parts = pathinfo($path);
if ( !isset($parts['filename']) ) {
$parts['filename'] = substr( $parts['basename'], 0, strrpos($parts['basename'], '.') );
if ( empty($parts['filename']) ) // there's no extension
$parts['filename'] = $parts['basename'];
}
return $parts;
}