数据的格式话有关问题

求教：数据的格式话问题
数据源格式：

<br />
$data = array(<br />
  array('id' => 1,'pid' => 0,'name' => 'a'),<br />
  array('id' => 2,'pid' => 0,'name' => 'b'),<br />
  array('id' => 3,'pid' => 1,'name' => 'c'),<br />
  array('id' => 4,'pid' => 1,'name' => 'd'),<br />
  array('id' => 5,'pid' => 3,'name' => 'e'),<br />
  array('id' => 6,'pid' => 3,'name' => 'f'),<br />
  array('id' => 7,'pid' => 6,'name' => 'g'),<br />
  array('id' => 8,'pid' => 6,'name' => 'h'),<br />
  array('id' => 9,'pid' => 8,'name' => 'i'),<br />
  array('id' => 10,'pid' => 8,'name' => 'j'),<br />
  array('id' => 11,'pid' => 9,'name' => 'l'),<br />
  array('id' => 12,'pid' => 9,'name' => 'm'),<br />
);<br />

需要将数据格式话成如下格式：

Array(
  'a' => Array(
    'c' => 'c',
    'd' => Array(
      'e' => 'e',
      'f' => Array(
        'g' => 'g'
        'h' => Array(
          'i' => Array(
            'l' => 'l',
            'm' => 'm'
          ),
          'j' => 'j'
        ),
      )
    )
  ),
  'b' => 'b'
)
求各位大神帮忙

------解决方案--------------------

<?php <br />
$data = array(<br>
  array('id' => 1,'pid' => 0,'name' => 'a'),<br>
  array('id' => 2,'pid' => 0,'name' => 'b'),<br>
  array('id' => 3,'pid' => 1,'name' => 'c'),<br>
  array('id' => 4,'pid' => 1,'name' => 'd'),<br>
  array('id' => 5,'pid' => 3,'name' => 'e'),<br>
  array('id' => 6,'pid' => 3,'name' => 'f'),<br>
  array('id' => 7,'pid' => 6,'name' => 'g'),<br>
  array('id' => 8,'pid' => 6,'name' => 'h'),<br>
  array('id' => 9,'pid' => 8,'name' => 'i'),<br>
  array('id' => 10,'pid' => 8,'name' => 'j'),<br>
  array('id' => 11,'pid' => 9,'name' => 'l'),<br>
  array('id' => 12,'pid' => 9,'name' => 'm'),<br>
);<br>
/********我是YD的分割线*************/<br>
$pid = 1000000;<br>
//$mark = 'c';<br>
foreach ($data as $key => $value){<br>
    <br>
    if ($value[pid] == $pid) { <div class="clear">




            </div>