php递归实现无限分类的方法

本文实例讲述了php递归实现无限分类的方法。分享给大家供大家参考。具体如下：

<?php

$rows = array(

array(

'id' => 1,

'name' => 'dev',

'parentid' => 0

),

array(

'id' => 2,

'name' => 'php',

'parentid' => 1

),

array(

'id' => 3,

'name' => 'smarty',

'parentid' => 2

),

array(

'id' => 4,

'name' => 'life',

'parentid' => 0

),

array(

'id' => 5,

'name' => 'pdo',

'parentid' => 2

),

array(

'id' => 6,

'name' => 'pdo-mysql',

'parentid' => 5

),

array(

'id' => 7,

'name' => 'java',

'parentid' => 1

)

);

// 72648

// 84072

function findChild(&$arr,$id){

$childs=array();

foreach ($arr as $k => $v){

if($v['parentid']== $id){

$childs[]=$v;

}

}

return $childs;

}

function build_tree($root_id){

global $rows;

$childs=findChild($rows,$root_id);

if(empty($childs)){

return null;

}

foreach ($childs as $k => $v){

$rescurTree=build_tree($v[id]);

if( null != $rescurTree){

$childs[$k]['childs']=$rescurTree;

}

}

return $childs;

}

$tree=build_tree(0);

echo memory_get_usage();

print_r($tree);

?>

希望本文所述对大家的php程序设计有所帮助。