PHP递归遍历多维数组实现无限分类的方法

<?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;
}
?>

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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