网上有很多,这是我自己做测试用的
$arr = array(
array(\'id\'=>1,\'name\'=>\'电脑\',\'pid\'=>0),
array(\'id\'=>2,\'name\'=>\'手机\',\'pid\'=>0),
array(\'id\'=>3,\'name\'=>\'笔记本\',\'pid\'=>1),
array(\'id\'=>4,\'name\'=>\'台式机\',\'pid\'=>1),
array(\'id\'=>5,\'name\'=>\'智能机\',\'pid\'=>2),
array(\'id\'=>6,\'name\'=>\'功能机\',\'pid\'=>2),
array(\'id\'=>7,\'name\'=>\'超级本\',\'pid\'=>3),
array(\'id\'=>8,\'name\'=>\'游戏本\',\'pid\'=>3),
);
/**
* @param $arr 数组
* @param $id id
* @param $level 层级
* @return array
*/
function demo($arr,$id,$level)
{
$list =array();
foreach ($arr as $k=>$v){
if ($v[\'pid\'] == $id){
$v[\'level\']=$level;
$v[\'son\'] = demo($arr,$v[\'id\'],$level+1);
$list[] = $v;
}
}
return $list;
}
echo "<pre>";
print_r(demo($arr,0,0));
输出结果:
Array
(
[0] => Array
(
[id] => 1
[name] => 电脑
[pid] => 0
[level] => 0
[son] => Array
(
[0] => Array
(
[id] => 3
[name] => 笔记本
[pid] => 1
[level] => 1
[son] => Array
(
[0] => Array
(
[id] => 7
[name] => 超级本
[pid] => 3
[level] => 2
[son] => Array
(
)
)
[1] => Array
(
[id] => 8
[name] => 游戏本
[pid] => 3
[level] => 2
[son] => Array
(
)
)
)
)
[1] => Array
(
[id] => 4
[name] => 台式机
[pid] => 1
[level] => 1
[son] => Array
(
)
)
)
)
[1] => Array
(
[id] => 2
[name] => 手机
[pid] => 0
[level] => 0
[son] => Array
(
[0] => Array
(
[id] => 5
[name] => 智能机
[pid] => 2
[level] => 1
[son] => Array
(
)
)
[1] => Array
(
[id] => 6
[name] => 功能机
[pid] => 2
[level] => 1
[son] => Array
(
)
)
)
)
)