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：

$data = array(

  array('id' => 1,'pid' => 0,'name' => 'a'),

  array('id' => 2,'pid' => 0,'name' => 'b'),

  array('id' => 3,'pid' => 1,'name' => 'c'),

  array('id' => 4,'pid' => 1,'name' => 'd'),

  array('id' => 5,'pid' => 3,'name' => 'e'),

  array('id' => 6,'pid' => 3,'name' => 'f'),

  array('id' => 7,'pid' => 6,'name' => 'g'),

  array('id' => 8,'pid' => 6,'name' => 'h'),

  array('id' => 9,'pid' => 8,'name' => 'i'),

  array('id' => 10,'pid' => 8,'name' => 'j'),

  array('id' => 11,'pid' => 9,'name' => 'l'),

  array('id' => 12,'pid' => 9,'name' => 'm'),

);

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--------------------

$data = array(

  array('id' => 1,'pid' => 0,'name' => 'a'),

  array('id' => 2,'pid' => 0,'name' => 'b'),

  array('id' => 3,'pid' => 1,'name' => 'c'),

  array('id' => 4,'pid' => 1,'name' => 'd'),

  array('id' => 5,'pid' => 3,'name' => 'e'),

  array('id' => 6,'pid' => 3,'name' => 'f'),

  array('id' => 7,'pid' => 6,'name' => 'g'),

  array('id' => 8,'pid' => 6,'name' => 'h'),

  array('id' => 9,'pid' => 8,'name' => 'i'),

  array('id' => 10,'pid' => 8,'name' => 'j'),

  array('id' => 11,'pid' => 9,'name' => 'l'),

  array('id' => 12,'pid' => 9,'name' => 'm'),

);

/********我是YD的分割线*************/

$pid = 1000000;

//$mark = 'c';

foreach ($data as $key => $value){

	

	if ($value[pid] == $pid) {