php常用封装函数

    function getChildrenCatIds(&$catIds,$pidCatIds)
    {
        // 第一次
        if(!$catIds){
            $catIds[] = $pidCatIds;
        }
        $ids = db('category')
            ->where('pid','in',$pidCatIds)
            ->column('id');
 
        if($ids){
            $catIds = array_merge($catIds,$ids);
            getChildrenCatIds($catIds,$ids);
        }
    }