php 多维数组排序问题 把数组test_data按id_arr顺序重新排序.
$test_data = array(
array("id"=>1,"data"=>"a"),
array("id"=>3,"data"=>"c"),
array("id"=>2,"data"=>"b"),
array("id"=>4,"data"=>"d"),
array("id"=>6,"data"=>"f"),
array("id"=>5,"data"=>"e")
);
$id_arr = array (2,1,3,4,5,6);
array_multisort不太会用,向大侠请教.