帮忙转化一个数组

[LiveAsaMonster]

有一个这样结构的数组

$arr = array(
	array('goods_id'=>'1','sku_id'=>'001','zk'=>'0.5'),
	array('goods_id'=>'1','sku_id'=>'002','zk'=>'0.5'),
	array('goods_id'=>'1','sku_id'=>'006','zk'=>'0.5'),

	array('goods_id'=>'2','sku_id'=>'003','zk'=>'0.8'),
	array('goods_id'=>'2','sku_id'=>'004','zk'=>'0.8'),
);

转化成

$_arr = array(
	'1' =>array(
				'zk'=>'0.5',
				'mx'=>array(
					array('sku_id'=>'001','zk'=>'0.5'),
					array('sku_id'=>'002','zk'=>'0.5'),
					array('sku_id'=>'006','zk'=>'0.5'),
				),
	'2' =>array(
				'zk'=>'0.8',
				'mx'=>array(
					array('sku_id'=>'003','zk'=>'0.8'),
					array('sku_id'=>'004','zk'=>'0.8'),
				),
	)
);

[代码如诗]

<?php
$arr = array(
    array('goods_id'=>'1','sku_id'=>'001','zk'=>'0.5'),
    array('goods_id'=>'1','sku_id'=>'002','zk'=>'0.5'),
    array('goods_id'=>'1','sku_id'=>'006','zk'=>'0.5'),

    array('goods_id'=>'2','sku_id'=>'003','zk'=>'0.8'),
    array('goods_id'=>'2','sku_id'=>'004','zk'=>'0.8'),
);

foreach($arr as $v){
	$tmp[$v['zk']]['zk']=$v['zk'];
	$tmp[$v['zk']]['mx'][]=array_splice($v,1,2);
}
print_r(array_values($tmp));