php无限分类 树状菜单经典代码
<?php
header("content-type:text/html;charset=utf-8");
$conn = mysql_connect("127.0.0.1", "root", "");
$s = mysql_select_db("local_df", $conn);
mysql_query("set names utf8");
$sql = "select * from tree";
$rs = mysql_query($sql);
$arr = array();
while ($r = mysql_fetch_array($rs)) {
$arr[] = $r;
}
$tree = getTree($arr);
print_r($tree);
/**
* 树状结构
* @param type $menus 节点信息和
* @return array
*/
function getTree($menus) {
$id = $level = 0;
$menuobjs = array();
$tree = array();
$notrootmenu = array();
foreach ($menus as $menu) {
$menuobj = new stdClass();
$menuobj->menu = $menu;
$id = $menu["id"];
$level = $menu["p_id"];
$menuobj->nodes = array();
$menuobjs[$id] = $menuobj;
if ($level) {
$notrootmenu[] = $menuobj;
} else {
$tree[] = $menuobj;
}
}
foreach ($notrootmenu as $menuobj) {
$menu = $menuobj->menu;
$id = $menu["id"];
$level = $menu["p_id"];
$menuobjs[$level]->nodes[] = $menuobj;
}
return $tree;
}
结果如下：
Array
(
[0] => stdClass Object
(
[menu] => Array
(
[0] => 1
[id] => 1
[1] => 江西
[name] => 江西
[2] => 0
[p_id] => 0
)
[nodes] => Array
(
[0] => stdClass Object
(
[menu] => Array
(
[0] => 4
[id] => 4
[1] => 赣州
[name] => 赣州
[2] => 1
[p_id] => 1
)
[nodes] => Array
(
[0] => stdClass Object
(
[menu] => Array
(
[0] => 8
[id] => 8
[1] => 信丰
[name] => 信丰
[2] => 4
[p_id] => 4
)
[nodes] => Array
(
)
)
)
)
[1] => stdClass Object
(
[menu] => Array
(
[0] => 5
[id] => 5
[1] => 南昌
[name] => 南昌
[2] => 1
[p_id] => 1
)
[nodes] => Array
(
)
)
)
)
[1] => stdClass Object
(
[menu] => Array
(
[0] => 2
[id] => 2
[1] => 湖南
[name] => 湖南
[2] => 0
[p_id] => 0
)
[nodes] => Array
(
[0] => stdClass Object
(
[menu] => Array
(
[0] => 6
[id] => 6
[1] => 长沙
[name] => 长沙
[2] => 2
[p_id] => 2
)
[nodes] => Array
(
)
)
[1] => stdClass Object
(
[menu] => Array
(
[0] => 7
[id] => 7
[1] => 岳阳
[name] => 岳阳
[2] => 2
[p_id] => 2
)
[nodes] => Array
(
)
)
)
)
[2] => stdClass Object
(
[menu] => Array
(
[0] => 3
[id] => 3
[1] => 浙江
[name] => 浙江
[2] => 0
[p_id] => 0
)
[nodes] => Array
(
)
)
)
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