Overtrue\Socialite\Providers\AbstractProvider::arrayItem PHP Method

    protected function arrayItem(array $array, $key, $default = null)
    {
        if (is_null($key)) {
            return $array;
        }
        if (isset($array[$key])) {
            return $array[$key];
        }
        foreach (explode('.', $key) as $segment) {
            if (!is_array($array) || !array_key_exists($segment, $array)) {
                return $default;
            }
            $array = $array[$segment];
        }
        return $array;
    }