php - 需要 MultiArray 取消设置值帮助

Question

我有一个名为的数组$mark_ary，其中包含：

Array
(
    [0] => 61
    [1] => 62
    [2] => 63
    [3] => 64
    [4] => 65
    [5] => 66
    [6] => 67
    [7] => 68
)

另一个名为$special_donors_array的变量包含以下内容：

Array
(
    [0] => Array
        (
            [group_id] => 4
            [user_id] => 61
            [group_leader] => 0
            [user_pending] => 0
            [username] => tester_8
            [username_clean] => tester_8
            [user_email] => tester_8@live.com
        )

    [1] => Array
        (
            [group_id] => 5
            [user_id] => 62
            [group_leader] => 0
            [user_pending] => 0
            [username] => tester_9
            [username_clean] => tester_9
            [user_email] => tester_9@live.com
        )

)

我需要[user_id]从变量的每个父键（在本例中为 [0] 和 [1]）中获取每个值$special_donors_array，并使用这些数字从数组变量中取消设置它们。$mark_ary

在实现我想要的之后，$mark_ary变量将如下所示：

Array
(
    [2] => 63
    [3] => 64
    [4] => 65
    [5] => 66
    [6] => 67
    [7] => 68
)

不幸的是，我什至想不出解决方案，我什至无法尝试，因为我不知道如何开始。我仍然需要获得更多与数组相关的知识。

想法？

Answer 1

foreach($special_donors_array as $special_donor){
                foreach($mark_ary as $k => $mark){
                    if($mark == $special_donor['user_id']){
                        unset($mark_ary[$k]);
                    }
                }
            }

Answer 2

foreach( $special_donors_array as $k => $v ) {
 if( isset($mark_ary[$k]) && $v['user_id'] === $mark_ary[$k] )
  unset($mark_ary[$k]);
}