FastJSON::__slashedChar PHP Method

    function __slashedChar(&$encode, $position)
    {
        $pos = 0;
        while ($encode[$position--] === '\\') {
            $pos++;
        }
        return $pos % 2;
    }

 function __endString(&$encode, $position, &$pos)
 {
     do {
         $position = strpos($encode, '"', $position + 1);
     } while ($position !== false && FastJSON::__slashedChar($encode, $position - 1));
     if ($position === false) {
         trigger_error('', E_USER_WARNING);
     }
     return $position - $pos;
 }