mirror of
https://github.com/WordPress/WordPress.git
synced 2024-11-09 04:11:10 +01:00
faca308a47
Props ayeshrajans, jrf, desrosj. Merges [43220] to the 4.9 branch. Fixes #43583. Built from https://develop.svn.wordpress.org/branches/4.9@43221 git-svn-id: http://core.svn.wordpress.org/branches/4.9@43050 1a063a9b-81f0-0310-95a4-ce76da25c4cd
540 lines
16 KiB
PHP
540 lines
16 KiB
PHP
<?php
|
|
/**
|
|
* WordPress implementation for PHP functions either missing from older PHP versions or not included by default.
|
|
*
|
|
* @package PHP
|
|
* @access private
|
|
*/
|
|
|
|
// If gettext isn't available
|
|
if ( !function_exists('_') ) {
|
|
function _($string) {
|
|
return $string;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Returns whether PCRE/u (PCRE_UTF8 modifier) is available for use.
|
|
*
|
|
* @ignore
|
|
* @since 4.2.2
|
|
* @access private
|
|
*
|
|
* @staticvar string $utf8_pcre
|
|
*
|
|
* @param bool $set - Used for testing only
|
|
* null : default - get PCRE/u capability
|
|
* false : Used for testing - return false for future calls to this function
|
|
* 'reset': Used for testing - restore default behavior of this function
|
|
*/
|
|
function _wp_can_use_pcre_u( $set = null ) {
|
|
static $utf8_pcre = 'reset';
|
|
|
|
if ( null !== $set ) {
|
|
$utf8_pcre = $set;
|
|
}
|
|
|
|
if ( 'reset' === $utf8_pcre ) {
|
|
$utf8_pcre = @preg_match( '/^./u', 'a' );
|
|
}
|
|
|
|
return $utf8_pcre;
|
|
}
|
|
|
|
if ( ! function_exists( 'mb_substr' ) ) :
|
|
/**
|
|
* Compat function to mimic mb_substr().
|
|
*
|
|
* @ignore
|
|
* @since 3.2.0
|
|
*
|
|
* @see _mb_substr()
|
|
*
|
|
* @param string $str The string to extract the substring from.
|
|
* @param int $start Position to being extraction from in `$str`.
|
|
* @param int|null $length Optional. Maximum number of characters to extract from `$str`.
|
|
* Default null.
|
|
* @param string|null $encoding Optional. Character encoding to use. Default null.
|
|
* @return string Extracted substring.
|
|
*/
|
|
function mb_substr( $str, $start, $length = null, $encoding = null ) {
|
|
return _mb_substr( $str, $start, $length, $encoding );
|
|
}
|
|
endif;
|
|
|
|
/**
|
|
* Internal compat function to mimic mb_substr().
|
|
*
|
|
* Only understands UTF-8 and 8bit. All other character sets will be treated as 8bit.
|
|
* For $encoding === UTF-8, the $str input is expected to be a valid UTF-8 byte sequence.
|
|
* The behavior of this function for invalid inputs is undefined.
|
|
*
|
|
* @ignore
|
|
* @since 3.2.0
|
|
*
|
|
* @param string $str The string to extract the substring from.
|
|
* @param int $start Position to being extraction from in `$str`.
|
|
* @param int|null $length Optional. Maximum number of characters to extract from `$str`.
|
|
* Default null.
|
|
* @param string|null $encoding Optional. Character encoding to use. Default null.
|
|
* @return string Extracted substring.
|
|
*/
|
|
function _mb_substr( $str, $start, $length = null, $encoding = null ) {
|
|
if ( null === $encoding ) {
|
|
$encoding = get_option( 'blog_charset' );
|
|
}
|
|
|
|
/*
|
|
* The solution below works only for UTF-8, so in case of a different
|
|
* charset just use built-in substr().
|
|
*/
|
|
if ( ! in_array( $encoding, array( 'utf8', 'utf-8', 'UTF8', 'UTF-8' ) ) ) {
|
|
return is_null( $length ) ? substr( $str, $start ) : substr( $str, $start, $length );
|
|
}
|
|
|
|
if ( _wp_can_use_pcre_u() ) {
|
|
// 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 );
|
|
}
|
|
|
|
$regex = '/(
|
|
[\x00-\x7F] # single-byte sequences 0xxxxxxx
|
|
| [\xC2-\xDF][\x80-\xBF] # double-byte sequences 110xxxxx 10xxxxxx
|
|
| \xE0[\xA0-\xBF][\x80-\xBF] # triple-byte sequences 1110xxxx 10xxxxxx * 2
|
|
| [\xE1-\xEC][\x80-\xBF]{2}
|
|
| \xED[\x80-\x9F][\x80-\xBF]
|
|
| [\xEE-\xEF][\x80-\xBF]{2}
|
|
| \xF0[\x90-\xBF][\x80-\xBF]{2} # four-byte sequences 11110xxx 10xxxxxx * 3
|
|
| [\xF1-\xF3][\x80-\xBF]{3}
|
|
| \xF4[\x80-\x8F][\x80-\xBF]{2}
|
|
)/x';
|
|
|
|
// Start with 1 element instead of 0 since the first thing we do is pop.
|
|
$chars = array( '' );
|
|
do {
|
|
// We had some string left over from the last round, but we counted it in that last round.
|
|
array_pop( $chars );
|
|
|
|
/*
|
|
* Split by UTF-8 character, limit to 1000 characters (last array element will contain
|
|
* the rest of the string).
|
|
*/
|
|
$pieces = preg_split( $regex, $str, 1000, PREG_SPLIT_DELIM_CAPTURE | PREG_SPLIT_NO_EMPTY );
|
|
|
|
$chars = array_merge( $chars, $pieces );
|
|
|
|
// If there's anything left over, repeat the loop.
|
|
} while ( count( $pieces ) > 1 && $str = array_pop( $pieces ) );
|
|
|
|
return join( '', array_slice( $chars, $start, $length ) );
|
|
}
|
|
|
|
if ( ! function_exists( 'mb_strlen' ) ) :
|
|
/**
|
|
* Compat function to mimic mb_strlen().
|
|
*
|
|
* @ignore
|
|
* @since 4.2.0
|
|
*
|
|
* @see _mb_strlen()
|
|
*
|
|
* @param string $str The string to retrieve the character length from.
|
|
* @param string|null $encoding Optional. Character encoding to use. Default null.
|
|
* @return int String length of `$str`.
|
|
*/
|
|
function mb_strlen( $str, $encoding = null ) {
|
|
return _mb_strlen( $str, $encoding );
|
|
}
|
|
endif;
|
|
|
|
/**
|
|
* Internal compat function to mimic mb_strlen().
|
|
*
|
|
* Only understands UTF-8 and 8bit. All other character sets will be treated as 8bit.
|
|
* For $encoding === UTF-8, the `$str` input is expected to be a valid UTF-8 byte
|
|
* sequence. The behavior of this function for invalid inputs is undefined.
|
|
*
|
|
* @ignore
|
|
* @since 4.2.0
|
|
*
|
|
* @param string $str The string to retrieve the character length from.
|
|
* @param string|null $encoding Optional. Character encoding to use. Default null.
|
|
* @return int String length of `$str`.
|
|
*/
|
|
function _mb_strlen( $str, $encoding = null ) {
|
|
if ( null === $encoding ) {
|
|
$encoding = get_option( 'blog_charset' );
|
|
}
|
|
|
|
/*
|
|
* The solution below works only for UTF-8, so in case of a different charset
|
|
* just use built-in strlen().
|
|
*/
|
|
if ( ! in_array( $encoding, array( 'utf8', 'utf-8', 'UTF8', 'UTF-8' ) ) ) {
|
|
return strlen( $str );
|
|
}
|
|
|
|
if ( _wp_can_use_pcre_u() ) {
|
|
// Use the regex unicode support to separate the UTF-8 characters into an array.
|
|
preg_match_all( '/./us', $str, $match );
|
|
return count( $match[0] );
|
|
}
|
|
|
|
$regex = '/(?:
|
|
[\x00-\x7F] # single-byte sequences 0xxxxxxx
|
|
| [\xC2-\xDF][\x80-\xBF] # double-byte sequences 110xxxxx 10xxxxxx
|
|
| \xE0[\xA0-\xBF][\x80-\xBF] # triple-byte sequences 1110xxxx 10xxxxxx * 2
|
|
| [\xE1-\xEC][\x80-\xBF]{2}
|
|
| \xED[\x80-\x9F][\x80-\xBF]
|
|
| [\xEE-\xEF][\x80-\xBF]{2}
|
|
| \xF0[\x90-\xBF][\x80-\xBF]{2} # four-byte sequences 11110xxx 10xxxxxx * 3
|
|
| [\xF1-\xF3][\x80-\xBF]{3}
|
|
| \xF4[\x80-\x8F][\x80-\xBF]{2}
|
|
)/x';
|
|
|
|
// Start at 1 instead of 0 since the first thing we do is decrement.
|
|
$count = 1;
|
|
do {
|
|
// We had some string left over from the last round, but we counted it in that last round.
|
|
$count--;
|
|
|
|
/*
|
|
* Split by UTF-8 character, limit to 1000 characters (last array element will contain
|
|
* the rest of the string).
|
|
*/
|
|
$pieces = preg_split( $regex, $str, 1000 );
|
|
|
|
// Increment.
|
|
$count += count( $pieces );
|
|
|
|
// If there's anything left over, repeat the loop.
|
|
} while ( $str = array_pop( $pieces ) );
|
|
|
|
// Fencepost: preg_split() always returns one extra item in the array.
|
|
return --$count;
|
|
}
|
|
|
|
if ( !function_exists('hash_hmac') ):
|
|
/**
|
|
* Compat function to mimic hash_hmac().
|
|
*
|
|
* @ignore
|
|
* @since 3.2.0
|
|
*
|
|
* @see _hash_hmac()
|
|
*
|
|
* @param string $algo Hash algorithm. Accepts 'md5' or 'sha1'.
|
|
* @param string $data Data to be hashed.
|
|
* @param string $key Secret key to use for generating the hash.
|
|
* @param bool $raw_output Optional. Whether to output raw binary data (true),
|
|
* or lowercase hexits (false). Default false.
|
|
* @return string|false The hash in output determined by `$raw_output`. False if `$algo`
|
|
* is unknown or invalid.
|
|
*/
|
|
function hash_hmac($algo, $data, $key, $raw_output = false) {
|
|
return _hash_hmac($algo, $data, $key, $raw_output);
|
|
}
|
|
endif;
|
|
|
|
/**
|
|
* Internal compat function to mimic hash_hmac().
|
|
*
|
|
* @ignore
|
|
* @since 3.2.0
|
|
*
|
|
* @param string $algo Hash algorithm. Accepts 'md5' or 'sha1'.
|
|
* @param string $data Data to be hashed.
|
|
* @param string $key Secret key to use for generating the hash.
|
|
* @param bool $raw_output Optional. Whether to output raw binary data (true),
|
|
* or lowercase hexits (false). Default false.
|
|
* @return string|false The hash in output determined by `$raw_output`. False if `$algo`
|
|
* is unknown or invalid.
|
|
*/
|
|
function _hash_hmac($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('json_encode') ) {
|
|
function json_encode( $string ) {
|
|
global $wp_json;
|
|
|
|
if ( ! ( $wp_json instanceof Services_JSON ) ) {
|
|
require_once( ABSPATH . WPINC . '/class-json.php' );
|
|
$wp_json = new Services_JSON();
|
|
}
|
|
|
|
return $wp_json->encodeUnsafe( $string );
|
|
}
|
|
}
|
|
|
|
if ( !function_exists('json_decode') ) {
|
|
/**
|
|
* @global Services_JSON $wp_json
|
|
* @param string $string
|
|
* @param bool $assoc_array
|
|
* @return object|array
|
|
*/
|
|
function json_decode( $string, $assoc_array = false ) {
|
|
global $wp_json;
|
|
|
|
if ( ! ($wp_json instanceof Services_JSON ) ) {
|
|
require_once( ABSPATH . WPINC . '/class-json.php' );
|
|
$wp_json = new Services_JSON();
|
|
}
|
|
|
|
$res = $wp_json->decode( $string );
|
|
if ( $assoc_array )
|
|
$res = _json_decode_object_helper( $res );
|
|
return $res;
|
|
}
|
|
|
|
/**
|
|
* @param object $data
|
|
* @return array
|
|
*/
|
|
function _json_decode_object_helper($data) {
|
|
if ( is_object($data) )
|
|
$data = get_object_vars($data);
|
|
return is_array($data) ? array_map(__FUNCTION__, $data) : $data;
|
|
}
|
|
}
|
|
|
|
if ( ! function_exists( 'hash_equals' ) ) :
|
|
/**
|
|
* Timing attack safe string comparison
|
|
*
|
|
* Compares two strings using the same time whether they're equal or not.
|
|
*
|
|
* This function was added in PHP 5.6.
|
|
*
|
|
* Note: It can leak the length of a string when arguments of differing length are supplied.
|
|
*
|
|
* @since 3.9.2
|
|
*
|
|
* @param string $a Expected string.
|
|
* @param string $b Actual, user supplied, string.
|
|
* @return bool Whether strings are equal.
|
|
*/
|
|
function hash_equals( $a, $b ) {
|
|
$a_length = strlen( $a );
|
|
if ( $a_length !== strlen( $b ) ) {
|
|
return false;
|
|
}
|
|
$result = 0;
|
|
|
|
// Do not attempt to "optimize" this.
|
|
for ( $i = 0; $i < $a_length; $i++ ) {
|
|
$result |= ord( $a[ $i ] ) ^ ord( $b[ $i ] );
|
|
}
|
|
|
|
return $result === 0;
|
|
}
|
|
endif;
|
|
|
|
// JSON_PRETTY_PRINT was introduced in PHP 5.4
|
|
// Defined here to prevent a notice when using it with wp_json_encode()
|
|
if ( ! defined( 'JSON_PRETTY_PRINT' ) ) {
|
|
define( 'JSON_PRETTY_PRINT', 128 );
|
|
}
|
|
|
|
if ( ! function_exists( 'json_last_error_msg' ) ) :
|
|
/**
|
|
* Retrieves the error string of the last json_encode() or json_decode() call.
|
|
*
|
|
* @since 4.4.0
|
|
*
|
|
* @internal This is a compatibility function for PHP <5.5
|
|
*
|
|
* @return bool|string Returns the error message on success, "No Error" if no error has occurred,
|
|
* or false on failure.
|
|
*/
|
|
function json_last_error_msg() {
|
|
// See https://core.trac.wordpress.org/ticket/27799.
|
|
if ( ! function_exists( 'json_last_error' ) ) {
|
|
return false;
|
|
}
|
|
|
|
$last_error_code = json_last_error();
|
|
|
|
// Just in case JSON_ERROR_NONE is not defined.
|
|
$error_code_none = defined( 'JSON_ERROR_NONE' ) ? JSON_ERROR_NONE : 0;
|
|
|
|
switch ( true ) {
|
|
case $last_error_code === $error_code_none:
|
|
return 'No error';
|
|
|
|
case defined( 'JSON_ERROR_DEPTH' ) && JSON_ERROR_DEPTH === $last_error_code:
|
|
return 'Maximum stack depth exceeded';
|
|
|
|
case defined( 'JSON_ERROR_STATE_MISMATCH' ) && JSON_ERROR_STATE_MISMATCH === $last_error_code:
|
|
return 'State mismatch (invalid or malformed JSON)';
|
|
|
|
case defined( 'JSON_ERROR_CTRL_CHAR' ) && JSON_ERROR_CTRL_CHAR === $last_error_code:
|
|
return 'Control character error, possibly incorrectly encoded';
|
|
|
|
case defined( 'JSON_ERROR_SYNTAX' ) && JSON_ERROR_SYNTAX === $last_error_code:
|
|
return 'Syntax error';
|
|
|
|
case defined( 'JSON_ERROR_UTF8' ) && JSON_ERROR_UTF8 === $last_error_code:
|
|
return 'Malformed UTF-8 characters, possibly incorrectly encoded';
|
|
|
|
case defined( 'JSON_ERROR_RECURSION' ) && JSON_ERROR_RECURSION === $last_error_code:
|
|
return 'Recursion detected';
|
|
|
|
case defined( 'JSON_ERROR_INF_OR_NAN' ) && JSON_ERROR_INF_OR_NAN === $last_error_code:
|
|
return 'Inf and NaN cannot be JSON encoded';
|
|
|
|
case defined( 'JSON_ERROR_UNSUPPORTED_TYPE' ) && JSON_ERROR_UNSUPPORTED_TYPE === $last_error_code:
|
|
return 'Type is not supported';
|
|
|
|
default:
|
|
return 'An unknown error occurred';
|
|
}
|
|
}
|
|
endif;
|
|
|
|
if ( ! interface_exists( 'JsonSerializable' ) ) {
|
|
define( 'WP_JSON_SERIALIZE_COMPATIBLE', true );
|
|
/**
|
|
* JsonSerializable interface.
|
|
*
|
|
* Compatibility shim for PHP <5.4
|
|
*
|
|
* @link https://secure.php.net/jsonserializable
|
|
*
|
|
* @since 4.4.0
|
|
*/
|
|
interface JsonSerializable {
|
|
public function jsonSerialize();
|
|
}
|
|
}
|
|
|
|
// random_int was introduced in PHP 7.0
|
|
if ( ! function_exists( 'random_int' ) ) {
|
|
require ABSPATH . WPINC . '/random_compat/random.php';
|
|
}
|
|
|
|
if ( ! function_exists( 'array_replace_recursive' ) ) :
|
|
/**
|
|
* PHP-agnostic version of {@link array_replace_recursive()}.
|
|
*
|
|
* The array_replace_recursive() function is a PHP 5.3 function. WordPress
|
|
* currently supports down to PHP 5.2, so this method is a workaround
|
|
* for PHP 5.2.
|
|
*
|
|
* Note: array_replace_recursive() supports infinite arguments, but for our use-
|
|
* case, we only need to support two arguments.
|
|
*
|
|
* Subject to removal once WordPress makes PHP 5.3.0 the minimum requirement.
|
|
*
|
|
* @since 4.5.3
|
|
*
|
|
* @see https://secure.php.net/manual/en/function.array-replace-recursive.php#109390
|
|
*
|
|
* @param array $base Array with keys needing to be replaced.
|
|
* @param array $replacements Array with the replaced keys.
|
|
*
|
|
* @return array
|
|
*/
|
|
function array_replace_recursive( $base = array(), $replacements = array() ) {
|
|
foreach ( array_slice( func_get_args(), 1 ) as $replacements ) {
|
|
$bref_stack = array( &$base );
|
|
$head_stack = array( $replacements );
|
|
|
|
do {
|
|
end( $bref_stack );
|
|
|
|
$bref = &$bref_stack[ key( $bref_stack ) ];
|
|
$head = array_pop( $head_stack );
|
|
|
|
unset( $bref_stack[ key( $bref_stack ) ] );
|
|
|
|
foreach ( array_keys( $head ) as $key ) {
|
|
if ( isset( $key, $bref ) &&
|
|
isset( $bref[ $key ] ) && is_array( $bref[ $key ] ) &&
|
|
isset( $head[ $key ] ) && is_array( $head[ $key ] )
|
|
) {
|
|
$bref_stack[] = &$bref[ $key ];
|
|
$head_stack[] = $head[ $key ];
|
|
} else {
|
|
$bref[ $key ] = $head[ $key ];
|
|
}
|
|
}
|
|
} while ( count( $head_stack ) );
|
|
}
|
|
|
|
return $base;
|
|
}
|
|
endif;
|
|
|
|
/**
|
|
* Polyfill for the SPL autoloader. In PHP 5.2 (but not 5.3 and later), SPL can
|
|
* be disabled, and PHP 7.2 raises notices if the compiler finds an __autoload()
|
|
* function declaration. Function availability is checked here, and the
|
|
* autoloader is included only if necessary.
|
|
*/
|
|
if ( ! function_exists( 'spl_autoload_register' ) ) {
|
|
require_once ABSPATH . WPINC . '/spl-autoload-compat.php';
|
|
}
|
|
|
|
if ( ! function_exists( 'is_countable' ) ) {
|
|
/**
|
|
* Polyfill for is_countable() function added in PHP 7.3.
|
|
*
|
|
* Verify that the content of a variable is an array or an object
|
|
* implementing the Countable interface.
|
|
*
|
|
* @since 4.9.6
|
|
*
|
|
* @param mixed $var The value to check.
|
|
*
|
|
* @return bool True if `$var` is countable, false otherwise.
|
|
*/
|
|
function is_countable( $var ) {
|
|
return ( is_array( $var )
|
|
|| $var instanceof Countable
|
|
|| $var instanceof SimpleXMLElement
|
|
|| $var instanceof ResourceBundle
|
|
);
|
|
}
|
|
}
|
|
|
|
if ( ! function_exists( 'is_iterable' ) ) {
|
|
/**
|
|
* Polyfill for is_iterable() function added in PHP 7.1.
|
|
*
|
|
* Verify that the content of a variable is an array or an object
|
|
* implementing the Traversable interface.
|
|
*
|
|
* @since 4.9.6
|
|
*
|
|
* @param mixed $var The value to check.
|
|
*
|
|
* @return bool True if `$var` is iterable, false otherwise.
|
|
*/
|
|
function is_iterable( $var ) {
|
|
return ( is_array( $var ) || $var instanceof Traversable );
|
|
}
|
|
}
|