250 lines
7.4 KiB
PHP
250 lines
7.4 KiB
PHP
<?php
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/**
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* WordPress implementation for PHP functions either missing from older PHP versions or not included by default.
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*
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* @package PHP
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* @access private
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*/
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// If gettext isn't available
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if ( !function_exists('_') ) {
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function _($string) {
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return $string;
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}
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}
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/**
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* Returns whether PCRE/u (PCRE_UTF8 modifier) is available for use.
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*
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* @ignore
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* @since 4.2.2
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* @access private
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*
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* @param bool $set - Used for testing only
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* null : default - get PCRE/u capability
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* false : Used for testing - return false for future calls to this function
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* 'reset': Used for testing - restore default behavior of this function
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*/
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function _wp_can_use_pcre_u( $set = null ) {
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static $utf8_pcre = 'reset';
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if ( null !== $set ) {
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$utf8_pcre = $set;
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}
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if ( 'reset' === $utf8_pcre ) {
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$utf8_pcre = @preg_match( '/^./u', 'a' );
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}
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return $utf8_pcre;
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}
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if ( ! function_exists( 'mb_substr' ) ) :
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function mb_substr( $str, $start, $length = null, $encoding = null ) {
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return _mb_substr( $str, $start, $length, $encoding );
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}
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endif;
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/*
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* Only understands UTF-8 and 8bit. All other character sets will be treated as 8bit.
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* For $encoding === UTF-8, the $str input is expected to be a valid UTF-8 byte sequence.
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* The behavior of this function for invalid inputs is undefined.
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*/
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function _mb_substr( $str, $start, $length = null, $encoding = null ) {
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if ( null === $encoding ) {
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$encoding = get_option( 'blog_charset' );
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}
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// The solution below works only for UTF-8,
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// so in case of a different charset just use built-in substr()
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if ( ! in_array( $encoding, array( 'utf8', 'utf-8', 'UTF8', 'UTF-8' ) ) ) {
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return is_null( $length ) ? substr( $str, $start ) : substr( $str, $start, $length );
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}
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if ( _wp_can_use_pcre_u() ) {
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// Use the regex unicode support to separate the UTF-8 characters into an array
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preg_match_all( '/./us', $str, $match );
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$chars = is_null( $length ) ? array_slice( $match[0], $start ) : array_slice( $match[0], $start, $length );
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return implode( '', $chars );
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}
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$regex = '/(
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[\x00-\x7F] # single-byte sequences 0xxxxxxx
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| [\xC2-\xDF][\x80-\xBF] # double-byte sequences 110xxxxx 10xxxxxx
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| \xE0[\xA0-\xBF][\x80-\xBF] # triple-byte sequences 1110xxxx 10xxxxxx * 2
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| [\xE1-\xEC][\x80-\xBF]{2}
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| \xED[\x80-\x9F][\x80-\xBF]
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| [\xEE-\xEF][\x80-\xBF]{2}
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| \xF0[\x90-\xBF][\x80-\xBF]{2} # four-byte sequences 11110xxx 10xxxxxx * 3
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| [\xF1-\xF3][\x80-\xBF]{3}
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| \xF4[\x80-\x8F][\x80-\xBF]{2}
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)/x';
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$chars = array( '' ); // Start with 1 element instead of 0 since the first thing we do is pop
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do {
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// We had some string left over from the last round, but we counted it in that last round.
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array_pop( $chars );
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// Split by UTF-8 character, limit to 1000 characters (last array element will contain the rest of the string)
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$pieces = preg_split( $regex, $str, 1000, PREG_SPLIT_DELIM_CAPTURE | PREG_SPLIT_NO_EMPTY );
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$chars = array_merge( $chars, $pieces );
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} while ( count( $pieces ) > 1 && $str = array_pop( $pieces ) ); // If there's anything left over, repeat the loop.
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return join( '', array_slice( $chars, $start, $length ) );
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}
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if ( ! function_exists( 'mb_strlen' ) ) :
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function mb_strlen( $str, $encoding = null ) {
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return _mb_strlen( $str, $encoding );
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}
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endif;
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/*
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* Only understands UTF-8 and 8bit. All other character sets will be treated as 8bit.
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* For $encoding === UTF-8, the $str input is expected to be a valid UTF-8 byte sequence.
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* The behavior of this function for invalid inputs is undefined.
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*/
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function _mb_strlen( $str, $encoding = null ) {
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if ( null === $encoding ) {
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$encoding = get_option( 'blog_charset' );
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}
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// The solution below works only for UTF-8,
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// so in case of a different charset just use built-in strlen()
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if ( ! in_array( $encoding, array( 'utf8', 'utf-8', 'UTF8', 'UTF-8' ) ) ) {
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return strlen( $str );
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}
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if ( _wp_can_use_pcre_u() ) {
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// Use the regex unicode support to separate the UTF-8 characters into an array
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preg_match_all( '/./us', $str, $match );
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return count( $match[0] );
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}
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$regex = '/(?:
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[\x00-\x7F] # single-byte sequences 0xxxxxxx
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| [\xC2-\xDF][\x80-\xBF] # double-byte sequences 110xxxxx 10xxxxxx
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| \xE0[\xA0-\xBF][\x80-\xBF] # triple-byte sequences 1110xxxx 10xxxxxx * 2
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| [\xE1-\xEC][\x80-\xBF]{2}
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| \xED[\x80-\x9F][\x80-\xBF]
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| [\xEE-\xEF][\x80-\xBF]{2}
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| \xF0[\x90-\xBF][\x80-\xBF]{2} # four-byte sequences 11110xxx 10xxxxxx * 3
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| [\xF1-\xF3][\x80-\xBF]{3}
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| \xF4[\x80-\x8F][\x80-\xBF]{2}
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)/x';
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$count = 1; // Start at 1 instead of 0 since the first thing we do is decrement
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do {
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// We had some string left over from the last round, but we counted it in that last round.
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$count--;
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// Split by UTF-8 character, limit to 1000 characters (last array element will contain the rest of the string)
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$pieces = preg_split( $regex, $str, 1000 );
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// Increment
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$count += count( $pieces );
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} while ( $str = array_pop( $pieces ) ); // If there's anything left over, repeat the loop.
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// Fencepost: preg_split() always returns one extra item in the array
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return --$count;
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}
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if ( !function_exists('hash_hmac') ):
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function hash_hmac($algo, $data, $key, $raw_output = false) {
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return _hash_hmac($algo, $data, $key, $raw_output);
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}
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endif;
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function _hash_hmac($algo, $data, $key, $raw_output = false) {
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$packs = array('md5' => 'H32', 'sha1' => 'H40');
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if ( !isset($packs[$algo]) )
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return false;
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$pack = $packs[$algo];
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if (strlen($key) > 64)
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$key = pack($pack, $algo($key));
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$key = str_pad($key, 64, chr(0));
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$ipad = (substr($key, 0, 64) ^ str_repeat(chr(0x36), 64));
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$opad = (substr($key, 0, 64) ^ str_repeat(chr(0x5C), 64));
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$hmac = $algo($opad . pack($pack, $algo($ipad . $data)));
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if ( $raw_output )
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return pack( $pack, $hmac );
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return $hmac;
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}
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if ( !function_exists('json_encode') ) {
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function json_encode( $string ) {
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global $wp_json;
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if ( !is_a($wp_json, 'Services_JSON') ) {
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require_once( ABSPATH . WPINC . '/class-json.php' );
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$wp_json = new Services_JSON();
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}
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return $wp_json->encodeUnsafe( $string );
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}
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}
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if ( !function_exists('json_decode') ) {
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function json_decode( $string, $assoc_array = false ) {
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global $wp_json;
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if ( !is_a($wp_json, 'Services_JSON') ) {
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require_once( ABSPATH . WPINC . '/class-json.php' );
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$wp_json = new Services_JSON();
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}
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$res = $wp_json->decode( $string );
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if ( $assoc_array )
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$res = _json_decode_object_helper( $res );
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return $res;
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}
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function _json_decode_object_helper($data) {
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if ( is_object($data) )
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$data = get_object_vars($data);
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return is_array($data) ? array_map(__FUNCTION__, $data) : $data;
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}
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}
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if ( ! function_exists( 'hash_equals' ) ) :
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/**
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* Compare two strings in constant time.
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*
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* This function was added in PHP 5.6.
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* It can leak the length of a string.
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*
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* @since 3.9.2
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*
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* @param string $a Expected string.
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* @param string $b Actual string.
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* @return bool Whether strings are equal.
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*/
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function hash_equals( $a, $b ) {
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$a_length = strlen( $a );
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if ( $a_length !== strlen( $b ) ) {
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return false;
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}
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$result = 0;
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// Do not attempt to "optimize" this.
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for ( $i = 0; $i < $a_length; $i++ ) {
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$result |= ord( $a[ $i ] ) ^ ord( $b[ $i ] );
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}
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return $result === 0;
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}
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endif;
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// JSON_PRETTY_PRINT was introduced in PHP 5.4
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// Defined here to prevent a notice when using it with wp_json_encode()
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if ( ! defined( 'JSON_PRETTY_PRINT' ) ) {
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define( 'JSON_PRETTY_PRINT', 128 );
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}
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