PHP递归遍历多维数组实现无限分类的方法
本文实例讲述了PHP递归遍历多维数组实现无限分类的方法。分享给大家供大家参考,具体如下:
- <?php
- //$data[]=array('id'=>1,'parentid'=>0,'name'=>'中国','img'=>'52091199');
- $data[]=array('id'=>1,'parentid'=>0,'name'=>'中国');
- $data[]=array('id'=>2,'parentid'=>0,'name'=>'美国');
- $data[]=array('id'=>3,'parentid'=>0,'name'=>'韩国');
- $data[]=array('id'=>4,'parentid'=>1,'name'=>'北京');
- $data[]=array('id'=>5,'parentid'=>1,'name'=>'上海');
- $data[]=array('id'=>6,'parentid'=>1,'name'=>'广西');
- $data[]=array('id'=>7,'parentid'=>6,'name'=>'桂林');
- $data[]=array('id'=>8,'parentid'=>6,'name'=>'南宁');
- $data[]=array('id'=>9,'parentid'=>6,'name'=>'柳州');
- $data[]=array('id'=>10,'parentid'=>2,'name'=>'纽约');
- $data[]=array('id'=>11,'parentid'=>2,'name'=>'华盛顿');
- $data[]=array('id'=>12,'parentid'=>3,'name'=>'首尔');
- $tree=build_tree($data,0);
- //echo memory_get_usage();
- print_r($tree);
- function findChild(&$arr,$id){
- $childs=array();
- foreach ($arr as $k => $v){
- if($v['parentid']== $id){
- $childs[]=$v;
- }
- }
- return $childs;
- }
- function build_tree($rows,$root_id){
- $childs=findChild($rows,$root_id);
- if(emptyempty($childs)){
- return null;
- }
- foreach ($childs as $k => $v){
- $rescurTree=build_tree($rows,$v['id']);
- //phpfensi.com
- if( null != $rescurTree){
- $childs[$k]['childs']=$rescurTree;
- }
- }
- return $childs;
- }
- ?>
运行结果:
- Array
- (
- [0] => Array
- (
- [id] => 1
- [parentid] => 0
- [name] => 中国
- [childs] => Array
- (
- [0] => Array
- (
- [id] => 4
- [parentid] => 1
- [name] => 北京
- )
- [1] => Array
- (
- [id] => 5
- [parentid] => 1
- [name] => 上海
- )
- [2] => Array
- (
- [id] => 6
- [parentid] => 1
- [name] => 广西
- [childs] => Array
- (
- [0] => Array
- (
- [id] => 7
- [parentid] => 6
- [name] => 桂林
- )
- [1] => Array
- (
- [id] => 8
- [parentid] => 6
- [name] => 南宁
- )
- [2] => Array
- (
- [id] => 9
- [parentid] => 6
- [name] => 柳州
- )
- )
- )
- )
- )
- [1] => Array
- (
- [id] => 2
- [parentid] => 0
- [name] => 美国
- [childs] => Array
- (
- [0] => Array
- (
- [id] => 10
- [parentid] => 2
- [name] => 纽约
- )
- [1] => Array
- (
- [id] => 11
- [parentid] => 2
- [name] => 华盛顿
- )
- )
- )
- [2] => Array
- (
- [id] => 3
- [parentid] => 0
- [name] => 韩国
- [childs] => Array
- (
- [0] => Array
- (
- [id] => 12
- [parentid] => 3
- [name] => 首尔
- )
- )
- )
- )