* 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