获取无限极分类底级分类之后查询（递归）

function get_categories_tree()
{
    $cat_class = array();

    /*
     适用与无限极分类展示
    */

    /* 获取当前分类及其子分类 （包括自己）*/
    $res = Db::name('DomelampNode')->where('pid',null)->order('id desc')->limit(10)->select();

    if(!empty($res)){

        foreach ($res AS $k=>$v)
        {
                $cat_class[$k]['id']   = $v['id'];
                $cat_class[$k]['name'] = $v['name'];
                $cat_class[$k]['pid']   = $v['pid'];
                $getSon = $this->get_child_tree($v['id'],1);
                if ($getSon)
                {
                    $cat_class[$k]['three_class'] = $this->get_child_tree($v['id']);
                }
        }
    }
    if(isset($cat_class))
    {
        return $cat_class;

    }
}

//获取当前分类下的子分类（不包括自己）
function get_child_tree($tree_id,$get=0)
{

    $two_arr = array();
    $res = Db::name('DomelampNode')->where('pid',$tree_id)->order('id desc')->limit(10)->select();

    if($get && empty($res)){
        return false;
    }
    foreach ($res AS $k=>$v)
    {
        $two_arr[$k]['id']   = $v['id'];
        $two_arr[$k]['name_son'] = $v['name'];
        $two_arr[$k]['pid']   = $v['pid'];

            $getSon = $this->get_child_tree($v['id'],1);
            if ($getSon){
                $two_arr[$k]['three_class'] = $this->get_child_tree($v['id']);
            }

    }
    return $two_arr;
}
//查询直推业绩300以上的人

SELECT id,username FROM fa_user AS u WHERE (SELECT SUM(kjsl) FROM fa_kjorder AS k LEFT JOIN fa_user AS yy ON k.username=yy.username WHERE k.addtime >= 1543075200 AND k.addtime <= 1546012799 AND yy.pid=u.username) >= 300