你还在用浪费时间又浪费内存的递归遍历无限极分类吗，看了该篇文章，我觉得你应该换换了。

这是我在OSChina上看到的一段非常精简的PHP无限极分类生成树方法，巧在引用，整理分享了。

复制代码 代码如下:function generateTree($items){    $tree = array();    foreach($items as $item){        if(isset($items[$item["pid"]])){            $items[$item["pid"]]["son"][] = &$items[$item["id"]];        }else{            $tree[] = &$items[$item["id"]];        }    }    return $tree;}$items = array(    1 => array("id" => 1, "pid" => 0, "name" => "安徽省"),    2 => array("id" => 2, "pid" => 0, "name" => "浙江省"),    3 => array("id" => 3, "pid" => 1, "name" => "合肥市"),    4 => array("id" => 4, "pid" => 3, "name" => "长丰县"),    5 => array("id" => 5, "pid" => 1, "name" => "安庆市"),);print_r(generateTree($items));

可以看到下面打印的结果：

复制代码 代码如下:Array(    [0] => Array        (            [id] => 1            [pid] => 0            [name] => 安徽省            [son] => Array                (                    [0] => Array                        (                            [id] => 3                            [pid] => 1                            [name] => 合肥市                            [son] => Array                                (                                    [0] => Array                                        (                                            [id] => 4                                            [pid] => 3                                            [name] => 长丰县                                        )                                 )                         )                     [1] => Array                        (                            [id] => 5                            [pid] => 1                            [name] => 安庆市                        )                 )         )     [1] => Array        (            [id] => 2            [pid] => 0            [name] => 浙江省        ) )上面生成树方法还可以精简到5行：复制代码 代码如下:function generateTree($items){    foreach($items as $item)        $items[$item["pid"]]["son"][$item["id"]] = &$items[$item["id"]];    return isset($items[0]["son"]) ? $items[0]["son"] : array();}

上面这种无限极分类数据树形结构化的方法值得借鉴。但是我觉得这段代码实际用途并不明显啊，你想取出格式化的树形数据还是要递归啊：

复制代码 代码如下:/** * 如何取数据格式化的树形数据 */$tree = generateTree($items);function getTreeData($tree){    foreach($tree as $t){        echo $t["name"]."<br>";        if(isset($t["son"])){            getTreeData($t["son"]);        }    }}getTreeData($tree);