App\services\CategoryService::getChilds PHP Method

    public static function getChilds($cate, $pid = 0)
    {
        $arr = array();
        foreach ($cate as $v) {
            if ($v['pid'] == $pid) {
                $arr[] = $v;
                $arr = array_merge($arr, self::getChilds($cate, $v['id']));
            }
        }
        return $arr;
    }