Unescape funkce pro string ktery prosel js funkci escape()

function unescape($source, $iconv_to = 'UTF-8') {
  $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') {
              // we got a unicode character
              $pos++;
              $unicodeHexVal = substr ($source, $pos, 4);
              $unicode = hexdec ($unicodeHexVal);
              $decodedStr .= code2utf($unicode);
              $pos += 4;
          }
          else {
              // we have an escaped ascii character
              $hexVal = substr ($source, $pos, 2);
              $decodedStr .= chr (hexdec ($hexVal));
              $pos += 2;
          }
      }
      else {
          $decodedStr .= $charAt;
          $pos++;
      }
  }

  if ($iconv_to != "UTF-8") {
      $decodedStr = iconv("UTF-8", $iconv_to, $decodedStr);
  }
  
  return $decodedStr;
}