Analysis of the implementation method of infinite level classification in PHP

The example in this article describes the implementation method of unlimited classification in PHP. Share it with everyone for your reference, the details are as follows:
1. Recursive

public function getInfo(){
$data=$this->select();
$arr=$this->noLimit($data,$f_id=0,$level=0);
return $arr;
}
//无限极分类
public function noLimit($data,$f_id=0,$level=0){
static $lists=array();
foreach($data as $key=>$v){
　　if($v['f_id']==$f_id){
　　　　$v['level']=$level;
　　　　$lists[]=$v;
　　　　$this->noLimit($data,$v['q_id'],$level+1);
　　}
}
return $lists;
}

2. Ordinary

public function getInfo(){
$u_id=session('u_id');
$data=$this->join("user join user_role on user.u_id=user_role.u_id join role_quan
 on user_role.j_id=role_quan.j_id join quan on quan.q_id=role_quan.q_id")->
 where("user.u_id=$u_id and quan.f_id=0")->group("quan.q_id")->select();
 foreach($data as $k=>$v){
 $arr=$this->join("user join user_role on user.u_id=user_role.u_id join role_quan
 on user_role.j_id=role_quan.j_id join quan on quan.q_id=role_quan.q_id")->
 where("user.u_id=$u_id and quan.f_id=".$v['q_id'])->group("quan.q_id")->select();
 $data[$k]['son']=$arr;
}

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