Infinitus classification in php

This article mainly introduces the Infinitus classification in php, which has certain reference value. Now I share it with everyone. Friends in need can refer to it

1. First, the table corresponding to the Infinitus classification The structure

| cate_id    | cate_name|  parentid(默认0)|
| --------   | -----:   | :----: |
| 1          | 键盘     |   0    |
| 2          | 机械键盘  |   1    |
| 3          | cherry键盘|  2    |

It can be seen that the value of cherry's parentid is equal to its upper level cate_id, which is the core of Infinitus classification

2. The infinite classification function is to convert the database The data in is re-sorted
Code under the controller:

public function index(){
    $cate = D('category')->catetree();    
    $this->assign('cate',$cate);        
    $this->display();
    }

Here $cate calls the catetree() method, then below is the code in our corresponding Model

Model下的代码：public function catetree(){
    $data = $this->select();    
    return $this->resort($data);
   }

First query the corresponding category table All the data inside and return a new method

public function resort($data,$parentid=0,$level=0){
    static $ret = array();    foreach ($data as $key => $v) {        
    if ($v['parentid']==$parentid) {        
    $v['level']=$level;        
    $ret[]=$v;       
    $this->resort($data,$v['cate_id'],$level+1);
        }
    }    return $ret ;
}

first generates a static array, and then traverses the $data passed by the catetree() method, and determines The condition is to find the top piece of data. First save the top-level data into a static array, then call itself and pass the id of the top-level column as a parameter.
In this way$parentid=$v['cate_id']
The final wireless classification function is completed!

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