An element in an array is looped plus a specified number?

an element in an array is iterated with a specified number
such as

.

clipboard.png

cycle wifimac and wanmac by 4

Php
Mar.14,2021 
    <?php
        $arr = array(
                array(
                    'check'   => 0,
                    'wifimac' => 1,
                    'wanmac'  => 2
                    ),
                array(
                    'check'   => 3,
                    'wifimac' => 4,
                    'wanmac'  => 5
                    )
            );
            
        array_walk_recursive($arr, function (&$value, $key) {
            if($key == 'wifimac' || $key == 'wanmac') {
                $value += 4;
            }        
        });
        
        var_dump($arr);

isn't it OK to traverse the foreach loop directly? 


Array
(
    [0] => Array
        (
            [wifimac] => 5
            [wanmac] => 7
        )

    [1] => Array
        (
            [wifimac] => 337
            [wanmac] => 32436
        )

)

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