php unescape

　　javascript escape用php解。差點被這搞死~"~

 function unescape ($source) { 
  $decodedStr = ""; 
  $pos = 0; 
  $len = strlen ($source); 
  while ($pos < $len)
  {
  $charAt = substr ($source, $pos, 1); 
   if ($charAt == '%') { 
    $pos++; 
    $charAt = substr ($source, $pos, 1); 
    if ($charAt == 'u')
    { 
     $pos++; 
     $unicodeHexVal = substr ($source, $pos, 4); 
     $unicode = hexdec ($unicodeHexVal); 
     $entity = "&#". $unicode . ';'; 
     $decodedStr .= utf8_encode ($entity); 
     $pos += 4; 
    } 
    else
    { 
     $hexVal = substr ($source, $pos, 2); 
     $decodedStr .= chr (hexdec ($hexVal)); 
     $pos += 2; 
    } 
   }
   else
   { 
    $decodedStr .= $charAt; 
    $pos++; 
   } 
  } 
  $decodedStr = mb_convert_encoding($decodedStr,'utf-8', 'HTML-ENTITIES');
  return $decodedStr; 
 }