protected static function hasEvenNumberOfParentheses(string $expression)

    {

        $tokens = token_get_all('<?php '.$expression);



        if (Arr::last($tokens) !== ')') {

            return false;

        }



        $opening = 0;

        $closing = 0;



        foreach ($tokens as $token) {

            if ($token == ')') {

                $closing++;

            } elseif ($token == '(') {

                $opening++;

            }

        }



        return $opening === $closing;

    }

protected static function hasEvenNumberOfParentheses(string $expression)

    {

        $tokens = token_get_all('<?php '.$expression);



        if (Arr::last($tokens) !== ')') {

            return false;

        }



        $opening = 0;

        $closing = 0;



        foreach ($tokens as $token) {

            if ($token == ')') {

                $closing++;

            } elseif ($token == '(') {

                $opening++;

            }

        }



        return $opening === $closing;

    }