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539 lines
16 KiB
539 lines
16 KiB
<?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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|
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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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/** |
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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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* @staticvar string $utf8_pcre |
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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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/** |
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* Compat function to mimic mb_substr(). |
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* |
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* @ignore |
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* @since 3.2.0 |
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* |
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* @see _mb_substr() |
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* |
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* @param string $str The string to extract the substring from. |
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* @param int $start Position to being extraction from in `$str`. |
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* @param int|null $length Optional. Maximum number of characters to extract from `$str`. |
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* Default null. |
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* @param string|null $encoding Optional. Character encoding to use. Default null. |
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* @return string Extracted substring. |
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*/ |
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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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/** |
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* Internal compat function to mimic mb_substr(). |
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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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* @ignore |
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* @since 3.2.0 |
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* |
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* @param string $str The string to extract the substring from. |
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* @param int $start Position to being extraction from in `$str`. |
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* @param int|null $length Optional. Maximum number of characters to extract from `$str`. |
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* Default null. |
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* @param string|null $encoding Optional. Character encoding to use. Default null. |
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* @return string Extracted substring. |
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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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|
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/* |
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* The solution below works only for UTF-8, so in case of a different |
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* charset just use built-in substr(). |
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*/ |
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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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// Start with 1 element instead of 0 since the first thing we do is pop. |
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$chars = array( '' ); |
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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( $chars ); |
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/* |
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* Split by UTF-8 character, limit to 1000 characters (last array element will contain |
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* the rest of the string). |
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*/ |
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$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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// If there's anything left over, repeat the loop. |
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} while ( count( $pieces ) > 1 && $str = array_pop( $pieces ) ); |
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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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/** |
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* Compat function to mimic mb_strlen(). |
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* |
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* @ignore |
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* @since 4.2.0 |
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* |
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* @see _mb_strlen() |
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* |
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* @param string $str The string to retrieve the character length from. |
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* @param string|null $encoding Optional. Character encoding to use. Default null. |
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* @return int String length of `$str`. |
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*/ |
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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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* Internal compat function to mimic mb_strlen(). |
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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 |
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* sequence. The behavior of this function for invalid inputs is undefined. |
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* |
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* @ignore |
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* @since 4.2.0 |
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* |
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* @param string $str The string to retrieve the character length from. |
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* @param string|null $encoding Optional. Character encoding to use. Default null. |
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* @return int String length of `$str`. |
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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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/* |
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* The solution below works only for UTF-8, so in case of a different charset |
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* just use built-in strlen(). |
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*/ |
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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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// Start at 1 instead of 0 since the first thing we do is decrement. |
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$count = 1; |
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do { |
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// We had some string left over from the last round, but we counted it in that last round. |
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$count--; |
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/* |
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* Split by UTF-8 character, limit to 1000 characters (last array element will contain |
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* the rest of the string). |
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*/ |
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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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// If there's anything left over, repeat the loop. |
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} while ( $str = array_pop( $pieces ) ); |
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// Fencepost: preg_split() always returns one extra item in the array. |
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return --$count; |
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} |
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if ( !function_exists('hash_hmac') ): |
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/** |
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* Compat function to mimic hash_hmac(). |
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* |
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* @ignore |
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* @since 3.2.0 |
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* |
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* @see _hash_hmac() |
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* |
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* @param string $algo Hash algorithm. Accepts 'md5' or 'sha1'. |
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* @param string $data Data to be hashed. |
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* @param string $key Secret key to use for generating the hash. |
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* @param bool $raw_output Optional. Whether to output raw binary data (true), |
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* or lowercase hexits (false). Default false. |
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* @return string|false The hash in output determined by `$raw_output`. False if `$algo` |
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* is unknown or invalid. |
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*/ |
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function hash_hmac($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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/** |
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* Internal compat function to mimic hash_hmac(). |
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* |
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* @ignore |
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* @since 3.2.0 |
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* |
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* @param string $algo Hash algorithm. Accepts 'md5' or 'sha1'. |
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* @param string $data Data to be hashed. |
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* @param string $key Secret key to use for generating the hash. |
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* @param bool $raw_output Optional. Whether to output raw binary data (true), |
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* or lowercase hexits (false). Default false. |
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* @return string|false The hash in output determined by `$raw_output`. False if `$algo` |
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* is unknown or invalid. |
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*/ |
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function _hash_hmac($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 ( ! ( $wp_json instanceof Services_JSON ) ) { |
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require_once( ABSPATH . WPINC . '/class-json.php' ); |
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$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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/** |
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* @global Services_JSON $wp_json |
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* @param string $string |
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* @param bool $assoc_array |
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* @return object|array |
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*/ |
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function json_decode( $string, $assoc_array = false ) { |
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global $wp_json; |
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if ( ! ($wp_json instanceof 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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/** |
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* @param object $data |
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* @return array |
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*/ |
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function _json_decode_object_helper($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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* Timing attack safe string comparison |
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* |
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* Compares two strings using the same time whether they're equal or not. |
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* |
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* This function was added in PHP 5.6. |
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* |
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* Note: It can leak the length of a string when arguments of differing length are supplied. |
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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, user supplied, 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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if ( ! function_exists( 'json_last_error_msg' ) ) : |
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/** |
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* Retrieves the error string of the last json_encode() or json_decode() call. |
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* |
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* @since 4.4.0 |
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* |
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* @internal This is a compatibility function for PHP <5.5 |
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* |
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* @return bool|string Returns the error message on success, "No Error" if no error has occurred, |
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* or false on failure. |
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*/ |
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function json_last_error_msg() { |
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// See https://core.trac.wordpress.org/ticket/27799. |
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if ( ! function_exists( 'json_last_error' ) ) { |
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return false; |
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} |
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$last_error_code = json_last_error(); |
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// Just in case JSON_ERROR_NONE is not defined. |
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$error_code_none = defined( 'JSON_ERROR_NONE' ) ? JSON_ERROR_NONE : 0; |
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switch ( true ) { |
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case $last_error_code === $error_code_none: |
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return 'No error'; |
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case defined( 'JSON_ERROR_DEPTH' ) && JSON_ERROR_DEPTH === $last_error_code: |
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return 'Maximum stack depth exceeded'; |
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case defined( 'JSON_ERROR_STATE_MISMATCH' ) && JSON_ERROR_STATE_MISMATCH === $last_error_code: |
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return 'State mismatch (invalid or malformed JSON)'; |
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case defined( 'JSON_ERROR_CTRL_CHAR' ) && JSON_ERROR_CTRL_CHAR === $last_error_code: |
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return 'Control character error, possibly incorrectly encoded'; |
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case defined( 'JSON_ERROR_SYNTAX' ) && JSON_ERROR_SYNTAX === $last_error_code: |
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return 'Syntax error'; |
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case defined( 'JSON_ERROR_UTF8' ) && JSON_ERROR_UTF8 === $last_error_code: |
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return 'Malformed UTF-8 characters, possibly incorrectly encoded'; |
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case defined( 'JSON_ERROR_RECURSION' ) && JSON_ERROR_RECURSION === $last_error_code: |
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return 'Recursion detected'; |
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case defined( 'JSON_ERROR_INF_OR_NAN' ) && JSON_ERROR_INF_OR_NAN === $last_error_code: |
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return 'Inf and NaN cannot be JSON encoded'; |
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case defined( 'JSON_ERROR_UNSUPPORTED_TYPE' ) && JSON_ERROR_UNSUPPORTED_TYPE === $last_error_code: |
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return 'Type is not supported'; |
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default: |
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return 'An unknown error occurred'; |
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} |
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} |
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endif; |
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if ( ! interface_exists( 'JsonSerializable' ) ) { |
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define( 'WP_JSON_SERIALIZE_COMPATIBLE', true ); |
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/** |
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* JsonSerializable interface. |
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* |
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* Compatibility shim for PHP <5.4 |
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* |
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* @link https://secure.php.net/jsonserializable |
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* |
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* @since 4.4.0 |
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*/ |
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interface JsonSerializable { |
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public function jsonSerialize(); |
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} |
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} |
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// random_int was introduced in PHP 7.0 |
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if ( ! function_exists( 'random_int' ) ) { |
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require ABSPATH . WPINC . '/random_compat/random.php'; |
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} |
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if ( ! function_exists( 'array_replace_recursive' ) ) : |
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/** |
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* PHP-agnostic version of {@link array_replace_recursive()}. |
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* |
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* The array_replace_recursive() function is a PHP 5.3 function. WordPress |
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* currently supports down to PHP 5.2, so this method is a workaround |
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* for PHP 5.2. |
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* |
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* Note: array_replace_recursive() supports infinite arguments, but for our use- |
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* case, we only need to support two arguments. |
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* |
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* Subject to removal once WordPress makes PHP 5.3.0 the minimum requirement. |
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* |
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* @since 4.5.3 |
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* |
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* @see https://secure.php.net/manual/en/function.array-replace-recursive.php#109390 |
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* |
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* @param array $base Array with keys needing to be replaced. |
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* @param array $replacements Array with the replaced keys. |
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* |
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* @return array |
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*/ |
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function array_replace_recursive( $base = array(), $replacements = array() ) { |
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foreach ( array_slice( func_get_args(), 1 ) as $replacements ) { |
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$bref_stack = array( &$base ); |
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$head_stack = array( $replacements ); |
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do { |
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end( $bref_stack ); |
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$bref = &$bref_stack[ key( $bref_stack ) ]; |
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$head = array_pop( $head_stack ); |
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unset( $bref_stack[ key( $bref_stack ) ] ); |
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foreach ( array_keys( $head ) as $key ) { |
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if ( isset( $key, $bref ) && |
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isset( $bref[ $key ] ) && is_array( $bref[ $key ] ) && |
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isset( $head[ $key ] ) && is_array( $head[ $key ] ) |
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) { |
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$bref_stack[] = &$bref[ $key ]; |
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$head_stack[] = $head[ $key ]; |
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} else { |
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$bref[ $key ] = $head[ $key ]; |
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} |
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} |
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} while ( count( $head_stack ) ); |
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} |
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return $base; |
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} |
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endif; |
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|
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/** |
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* Polyfill for the SPL autoloader. In PHP 5.2 (but not 5.3 and later), SPL can |
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* be disabled, and PHP 7.2 raises notices if the compiler finds an __autoload() |
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* function declaration. Function availability is checked here, and the |
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* autoloader is included only if necessary. |
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*/ |
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if ( ! function_exists( 'spl_autoload_register' ) ) { |
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require_once ABSPATH . WPINC . '/spl-autoload-compat.php'; |
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} |
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|
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if ( ! function_exists( 'is_countable' ) ) { |
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/** |
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* Polyfill for is_countable() function added in PHP 7.3. |
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* |
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* Verify that the content of a variable is an array or an object |
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* implementing the Countable interface. |
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* |
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* @since 4.9.6 |
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* |
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* @param mixed $var The value to check. |
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* |
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* @return bool True if `$var` is countable, false otherwise. |
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*/ |
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function is_countable( $var ) { |
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return ( is_array( $var ) |
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|| $var instanceof Countable |
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|| $var instanceof SimpleXMLElement |
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|| $var instanceof ResourceBundle |
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); |
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} |
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} |
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|
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if ( ! function_exists( 'is_iterable' ) ) { |
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/** |
|
* Polyfill for is_iterable() function added in PHP 7.1. |
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* |
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* Verify that the content of a variable is an array or an object |
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* implementing the Traversable interface. |
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* |
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* @since 4.9.6 |
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* |
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* @param mixed $var The value to check. |
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* |
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* @return bool True if `$var` is iterable, false otherwise. |
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*/ |
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function is_iterable( $var ) { |
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return ( is_array( $var ) || $var instanceof Traversable ); |
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} |
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}
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