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   1  <?php
   2  /**
   3   * WordPress implementation for PHP functions either missing from older PHP versions or not included by default.
   4   *
   5   * @package PHP
   6   * @access private
   7   */
   8  
   9  // If gettext isn't available
  10  if ( !function_exists('_') ) {
  11      function _($string) {
  12          return $string;
  13      }
  14  }
  15  
  16  if ( !function_exists('mb_substr') ):
  17  	function mb_substr( $str, $start, $length=null, $encoding=null ) {
  18          return _mb_substr($str, $start, $length, $encoding);
  19      }
  20  endif;
  21  
  22  function _mb_substr( $str, $start, $length=null, $encoding=null ) {
  23      // the solution below, works only for utf-8, so in case of a different
  24      // charset, just use built-in substr
  25      $charset = get_option( 'blog_charset' );
  26      if ( !in_array( $charset, array('utf8', 'utf-8', 'UTF8', 'UTF-8') ) ) {
  27          return is_null( $length )? substr( $str, $start ) : substr( $str, $start, $length);
  28      }
  29      // use the regex unicode support to separate the UTF-8 characters into an array
  30      preg_match_all( '/./us', $str, $match );
  31      $chars = is_null( $length )? array_slice( $match[0], $start ) : array_slice( $match[0], $start, $length );
  32      return implode( '', $chars );
  33  }
  34  
  35  if ( !function_exists('hash_hmac') ):
  36  function hash_hmac($algo, $data, $key, $raw_output = false) {
  37      return _hash_hmac($algo, $data, $key, $raw_output);
  38  }
  39  endif;
  40  
  41  function _hash_hmac($algo, $data, $key, $raw_output = false) {
  42      $packs = array('md5' => 'H32', 'sha1' => 'H40');
  43  
  44      if ( !isset($packs[$algo]) )
  45          return false;
  46  
  47      $pack = $packs[$algo];
  48  
  49      if (strlen($key) > 64)
  50          $key = pack($pack, $algo($key));
  51  
  52      $key = str_pad($key, 64, chr(0));
  53  
  54      $ipad = (substr($key, 0, 64) ^ str_repeat(chr(0x36), 64));
  55      $opad = (substr($key, 0, 64) ^ str_repeat(chr(0x5C), 64));
  56  
  57      $hmac = $algo($opad . pack($pack, $algo($ipad . $data)));
  58  
  59      if ( $raw_output )
  60          return pack( $pack, $hmac );
  61      return $hmac;
  62  }
  63  
  64  if ( !function_exists('json_encode') ) {
  65  	function json_encode( $string ) {
  66          global $wp_json;
  67  
  68          if ( !is_a($wp_json, 'Services_JSON') ) {
  69              require_once ( ABSPATH . WPINC . '/class-json.php' );
  70              $wp_json = new Services_JSON();
  71          }
  72  
  73          return $wp_json->encodeUnsafe( $string );
  74      }
  75  }
  76  
  77  if ( !function_exists('json_decode') ) {
  78  	function json_decode( $string, $assoc_array = false ) {
  79          global $wp_json;
  80  
  81          if ( !is_a($wp_json, 'Services_JSON') ) {
  82              require_once ( ABSPATH . WPINC . '/class-json.php' );
  83              $wp_json = new Services_JSON();
  84          }
  85  
  86          $res = $wp_json->decode( $string );
  87          if ( $assoc_array )
  88              $res = _json_decode_object_helper( $res );
  89          return $res;
  90      }
  91  	function _json_decode_object_helper($data) {
  92          if ( is_object($data) )
  93              $data = get_object_vars($data);
  94          return is_array($data) ? array_map(__FUNCTION__, $data) : $data;
  95      }
  96  }