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。