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   1  <?php
   2  // Last sync [WP11537]
   3  
   4  /**
   5   * BackPress implementation for PHP functions missing from older PHP versions.
   6   *
   7   * @package PHP
   8   * @access private
   9   */
  10  
  11  if ( !function_exists( 'http_build_query' ) ) {
  12      // Added in PHP 5.0.0
  13  	function http_build_query( $data, $prefix = null, $sep = null )
  14      {
  15          return _http_build_query( $data, $prefix, $sep );
  16      }
  17  }
  18  
  19  if ( !function_exists( '_http_build_query' ) ) {
  20      // from php.net (modified by Mark Jaquith to behave like the native PHP5 function)
  21  	function _http_build_query($data, $prefix = null, $sep = null, $key = '', $urlencode = true)
  22      {
  23          $ret = array();
  24  
  25          foreach ( (array) $data as $k => $v ) {
  26              if ( $urlencode) {
  27                  $k = urlencode( $k );
  28              }
  29              if ( is_int( $k ) && $prefix != null ) {
  30                  $k = $prefix.$k;
  31              }
  32              if ( !empty( $key ) ) {
  33                  $k = $key . '%5B' . $k . '%5D';
  34              }
  35              if ( $v === NULL ) {
  36                  continue;
  37              } elseif ( $v === FALSE ) {
  38                  $v = '0';
  39              }
  40  
  41              if ( is_array( $v ) || is_object( $v ) ) {
  42                  array_push( $ret, _http_build_query( $v, '', $sep, $k, $urlencode ) );
  43              } elseif ( $urlencode ) {
  44                  array_push( $ret, $k . '=' . urlencode( $v ) );
  45              } else {
  46                  array_push( $ret, $k . '=' . $v );
  47              }
  48          }
  49  
  50          if ( NULL === $sep ) {
  51              $sep = ini_get( 'arg_separator.output' );
  52          }
  53  
  54          return implode( $sep, $ret );
  55      }
  56  }
  57  
  58  if ( !function_exists( '_' ) ) {
  59      // Alias of gettext() - requires l10n functions
  60      function _( $string )
  61      {
  62          return $string;
  63      }
  64  }
  65  
  66  if ( !function_exists( 'stripos' ) ) {
  67      // Added in PHP 5.0.0
  68  	function stripos( $haystack, $needle, $offset = 0 )
  69      {
  70          return strpos( strtolower( $haystack ), strtolower( $needle ), $offset );
  71      }
  72  }
  73  
  74  if ( !function_exists( 'hash_hmac' ) ) {
  75      // Added in PHP 5.1.2
  76  	function hash_hmac( $algo, $data, $key, $raw_output = false )
  77      {
  78          $packs = array( 'md5' => 'H32', 'sha1' => 'H40' );
  79  
  80          if ( !isset( $packs[$algo] ) ) {
  81              return false;
  82          }
  83  
  84          $pack = $packs[$algo];
  85  
  86          if ( strlen( $key ) > 64 ) {
  87              $key = pack( $pack, $algo( $key ) );
  88          } elseif ( strlen($key) < 64 ) {
  89              $key = str_pad( $key, 64, chr( 0 ) );
  90          }
  91  
  92          $ipad = ( substr( $key, 0, 64 ) ^ str_repeat( chr( 0x36 ), 64 ) );
  93          $opad = ( substr( $key, 0, 64 ) ^ str_repeat( chr( 0x5C ), 64 ) );
  94  
  95          return $algo( $opad . pack( $pack, $algo ( $ipad . $data ) ) );
  96      }
  97  }
  98  
  99  if ( !function_exists( 'mb_substr' ) ) {
 100      // Requires multi-byte support in PHP
 101  	function mb_substr( $str, $start, $length = null, $encoding = null )
 102      {
 103          return _mb_substr( $str, $start, $length, $encoding );
 104      }
 105  }
 106  
 107  if ( !function_exists( '_mb_substr' ) ) {
 108  	function _mb_substr( $str, $start, $length = null, $encoding = null )
 109      {
 110          // the solution below, works only for utf-8, so in case of a different
 111          // charset, just use built-in substr
 112          $charset = backpress_get_option( 'charset' );
 113          if ( !in_array( $charset, array( 'utf8', 'utf-8', 'UTF8', 'UTF-8' ) ) ) {
 114              return is_null( $length )? substr( $str, $start ) : substr( $str, $start, $length);
 115          }
 116          // use the regex unicode support to separate the UTF-8 characters into an array
 117          preg_match_all( '/./us', $str, $match );
 118          $chars = is_null( $length )? array_slice( $match[0], $start ) : array_slice( $match[0], $start, $length );
 119          return implode( '', $chars );
 120      }
 121  }
 122  
 123  if ( !function_exists( 'htmlspecialchars_decode' ) ) {
 124      // Added in PHP 5.1.0
 125      // Error checks from PEAR::PHP_Compat
 126  	function htmlspecialchars_decode( $str, $quote_style = ENT_COMPAT )
 127      {
 128          if ( !is_scalar( $string ) ) {
 129              trigger_error( 'htmlspecialchars_decode() expects parameter 1 to be string, ' . gettype( $string ) . ' given', E_USER_WARNING );
 130              return;
 131          }
 132  
 133          if ( !is_int( $quote_style ) && $quote_style !== null ) {
 134              trigger_error( 'htmlspecialchars_decode() expects parameter 2 to be integer, ' . gettype( $quote_style ) . ' given', E_USER_WARNING );
 135              return;
 136          }
 137  
 138          return wp_specialchars_decode( $str, $quote_style );
 139      }
 140  }