PHP数组 按照某个元素排序

按照 flag 排序：

$arr[] = array('name'=>'a','flag'=>1);$arr[] = array('name'=>'b','flag'=>2);$arr[] = array('name'=>'a','flag'=>1);$flag=array();foreach($arr as $arr2){    $flag[]=$arr2["flag"];    }array_multisort($flag, SORT_ASC, $arr);print_r($arr);

结果：

Array ( [0] => Array ( [name] => a [flag] => 1 ) [1] => Array ( [name] => a [flag] => 1 ) [2] => Array ( [name] => b [flag] => 2 ) )