+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( ABSPATH . WPINC . '/class-json.php' );
+ $wp_json = new Services_JSON();
+ }
+
+ return $wp_json->encodeUnsafe( $string );
+ }
+}
+
+if ( !function_exists('json_decode') ) {
+ function json_decode( $string, $assoc_array = false ) {
+ global $wp_json;
+
+ if ( !is_a($wp_json, '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 $res;
+ }
+ function _json_decode_object_helper($data) {
+ if ( is_object($data) )
+ $data = get_object_vars($data);
+ return is_array($data) ? array_map(__FUNCTION__, $data) : $data;
+ }
+}
+
+// pathinfo that fills 'filename' without extension like in PHP 5.2+
+function pathinfo52($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;
+}