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,$root_id);
  if(empty($childs)){
   return null;
  }
 foreach ($childs as $k => $v){
  $rescurTree=build_tree($rows,$v["id"]);
  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
      )
    )
  )
)

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希望本文所述对大家PHP程序设计有所帮助。