tFPDF::_escape PHP Method

    function _escape($s)
    {
        // Escape special characters in strings
        $s = str_replace('\\', '\\\\', $s);
        $s = str_replace('(', '\\(', $s);
        $s = str_replace(')', '\\)', $s);
        $s = str_replace("\r", '\\r', $s);
        return $s;
    }