如何根据数组里一个元素的值来转化分类数组?

[black_OX]

比如有一个二维数组:
$arr = array(
array('a' => 'dd', 'b' => 27, 'c' => 1),
array('a' => 'af', 'b' => 25, 'c' => 2),
array('a' => 'ev', 'b' => 54, 'c' => 2),
array('a' => 'vd', 'b' => 76, 'c' => 1)
);

要元素c的值相同的一个数组.转化成这样的:

$arr = array(
array(
array('a' => 'dd', 'b' => 27, 'c' => 1),
array('a' => 'vd', 'b' => 76, 'c' => 1)
),
array(
array('a' => 'af', 'b' => 25, 'c' => 2),
array('a' => 'ev', 'b' => 54, 'c' => 2)
)
);

求思路

[ayzen1988]

$arr = array(
        array('a' => 'dd', 'b' => 27, 'c' => 1),
        array('a' => 'af', 'b' => 25, 'c' => 2),
        array('a' => 'ev', 'b' => 54, 'c' => 2),
        array('a' => 'vd', 'b' => 76, 'c' => 1)
        );
foreach($arr as $key=>$value)
{
  $array] = $value;
}
print_r($array);

[ayzen1988]

$array[$value['c']] = $value;

[ayzen1988]

$array[$value['c']][] = $value;//循环体内的 上面2句打错了；