排序.小弟我想下面的数组以cat_name来排序

排序...我想下面的数组以cat_name来排序
Array
(
[1] => Array
(
[cat_id] => 1
[cat_name] => Other
)

[2827511014] => Array
(
[cat_id] => 2827511014
[cat_name] => mobile phone housing
)

[2827513014] => Array
(
[cat_id] => 2827513014
[cat_name] => mobile phone other accessories
)

[2827516014] => Array
(
[cat_id] => 2827516014
[cat_name] => PC Accessories
)

[2827518014] => Array
(
[cat_id] => 2827518014
[cat_name] => Electronics
)

[3089502014] => Array
(
[cat_id] => 3089502014
[cat_name] => Jewelry Accessories
[child] => Array
(
[3089509014] => Array
(
[cat_id] => 3089509014
[cat_name] => Necklace
)

[3089510014] => Array
(
[cat_id] => 3089510014
[cat_name] => Earrings
)

[3158873014] => Array
(
[cat_id] => 3158873014
[cat_name] => headband
)

)

)

。。。。。。
------解决方案--------------------

$a = 你的数组；
foreach($a as $r) $b[] = $r['cat_name'];
array_multisort($b, $a);