How to delete array in php foreach

php foreach method to delete an array: first create a PHP sample file; then define an array; finally delete through "foreach($db as $k=>$v){...}" That’s it.

The operating environment of this article: Windows7 system, PHP7.1 version, DELL G3 computer

Specific questions:

How to delete an array in php foreach?

PHP foreach delete array

Array output, I want to delete one value and display the remaining values.

Array:

Array
(
    [0] => Array
        (
            [uid] => 1
            [tid] => 0
            [username] => 123
            [truename] => 3333
            [groupid] => 1
        )
    [1] => Array
        (
            [uid] => 2
            [tid] => 0
            [username] => 321
            [truename] => 5
            [groupid] => 1
        )
    [2] => Array
        (
            [uid] => 4
            [tid] => 0
            [username] => 456
            [truename] => 5
            [groupid] => 2
        )

I only want to display the array of [groupid] => 2, and delete [groupid] => 1.

foreach($db as $v){  
    if($v['groupid'] == 1){
        unset($db[$v['groupid']]);
    }
｝

Implementation method:

foreach($db as $k=>$v){  

    if($v['groupid'] == 1){        unset($db[$k]);
    }
｝

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