Recursive unlimited access superiors or subordinates

　　 $this->get_array($user['uid'],1);

    function get_array($user_id,$top=0){
        $sql = 'SELECT * FROM  ' . tablename('weixinmao_house_userinfo').'where pid=:pid';
        $params = array(':pid' => $user_id);
        $rows = pdo_fetchall($sql, $params);
        foreach ($rows as $key=>$value)
        {
            $r = $this->get_array(value $ [ 'uid']); // call the function, passing parameters, to research the lower 
            $ arr [0] [ 'Children'] [ $ Key ] [ 'uid'] = $ value [ 'uid']; / / combination array 
            $ ARR [0] [ 'Children'] [ $ Key ] [ 'wechaname'] = $ value [ 'wechaname']; // composition array 
            IF ( is_array ( $ R & lt )) {
                 $ ARR [0] [ 'Children'] [ $ Key ] [ 'Children'] = $ R & lt [0] [ 'Children' ]; 
            } 

        } 
        return  $ ARR ; 
    }