src/Net/URL2.php
private function _queryKeyBracketOffset($key)
    {
        if (false !== $open = strpos($key, '[')
            and false === strpos($key, ']', $open + 1)
        ) {
            $open = false;
        }

        return $open;
    }
private function _queryKeyBracketOffset($key)
    {
        if (false !== $open = strpos($key, '[')
            and false === strpos($key, ']', $open + 1)
        ) {
            $open = false;
        }

        return $open;
    }
Query-key has brackets ("...[]")

@param string $key query-key

@return bool|int offset of opening bracket, false if no brackets