PHP判断数组是几维数组

//判断几维数组
    private function countDimensions($array)
    {
        if (!is_array($array)) {
            return 0;
        } else {
            $maxDimension = 0;
            foreach ($array as $value) {
                $dimension = self::countDimensions($value);
                if ($dimension > $maxDimension) {
                    $maxDimension = $dimension;
                }
            }
            return $maxDimension + 1;
        }
    }