<?php
function build(){
$items = [
1=>['categories_id'=>1,'name'=>'父1','parent_id'=>0],
9=>['categories_id'=>9,'name'=>'儿3-1','parent_id'=>3],
15=>['categories_id'=>15,'name'=>'儿3-1-1','parent_id'=>14],
3=>['categories_id'=>3,'name'=>'父3','parent_id'=>0],
4=>['categories_id'=>4,'name'=>'儿1-1','parent_id'=>1],
6=>['categories_id'=>6,'name'=>'儿1-3','parent_id'=>1],
12=>['categories_id'=>12,'name'=>'儿2-1-1','parent_id'=>7],
2=>['categories_id'=>2,'name'=>'父2','parent_id'=>0],
5=>['categories_id'=>5,'name'=>'儿1-2','parent_id'=>1],
8=>['categories_id'=>8,'name'=>'儿2-1','parent_id'=>2],
11=>['categories_id'=>11,'name'=>'儿1-1-1','parent_id'=>4],
7=>['categories_id'=>7,'name'=>'儿2-1','parent_id'=>2],
10=>['categories_id'=>10,'name'=>'儿3-1-1','parent_id'=>9],
13=>['categories_id'=>13,'name'=>'儿3-1-1','parent_id'=>10],
14=>['categories_id'=>14,'name'=>'儿3-1-1','parent_id'=>13],
16=>['categories_id'=>16,'name'=>'儿3-1-1','parent_id'=>10],
];
$tree = array();
foreach($items as $cid => $item){
if(isset($items[$item['parent_id']])){
// var_dump($tree);
$items[$item['parent_id']]['childs'][$cid] = &$items[$cid];
}else{
$tree[$cid] = &$items[$cid];
}
}
return $tree;
}
$tree = build();
print_r($tree);
function get($tree, $level) {
// static $tree;
$lv = 1;
$res = array();
foreach ($tree as $cid => $item) {
/*if ($item['parent_id'] == 0) {
if ($lv == $level) {
continue;
}
$res[$cid] = $item;
$lv ++;
}*/
// var_dump($item);
if ($item['parent_id'] == 0) {
$lv = 1;
}
if (is_array($item)) {
$lv ++;
return get($item, $level);
}
var_dump($lv);
}
}
$get = get($tree, 2);
// var_dump($get);
preferences:
55.32 ms | 402 KiB | 5 Q