这样的数组如何让它树状显示呢

这样的数组怎么让它树状显示呢？

Array<br>(<br>    [1] => Array<br>        (<br>            [id] => 1<br>            [name] => 世界<br>            [pid] => 0<br>            [2] => Array<br>                (<br>                    [id] => 2<br>                    [name] => 中国<br>                    [pid] => 1<br>                    [4] => Array<br>                        (<br>                            [id] => 4<br>                            [name] => 湖南<br>                            [pid] => 2<br>                        )<br><br>                )<br><br>            [3] => Array<br>                (<br>                    [id] => 3<br>                    [name] => 美国<br>                    [pid] => 1<br>                )<br><div class="clear">
                 
              
              
        
            </div>