如何在 PHP 中对具有相同数组值的值求和

我合并了两个数组(都是从MySQL获取的，它们位于不同的表中)，现在我想用数组中的相同值对所有数组求和.

$merged_arr = array_merge($reg, $rel);个

Array
(
    [0] => Array
        (
            [DEPARTMENT] => LEAFSPRINGDIRECT
            [BASIC INCOME] => 3035.37
            [OT PAY] => 0
        )

    [1] => Array
        (
            [DEPARTMENT] => MUFFLERDIRECT
            [BASIC INCOME] => 24962.09
            [OT PAY] => 5358.76
        )

    [2] => Array
        (
            [DEPARTMENT] => MUFFLERDIRECT 
            [BASIC INCOME] => 14082.080000000002
            [OT PAY] => 3248.4
        )
)

这就是我试过的，但我不得不一遍又一遍地做出如果-否则的 Select .

foreach($merged_arr as $key => $val) 
    {
        // echo $val['BASIC INCOME']."<br>";

        // echo array_keys(array_values($new_arr)[$key])[$count]."-".array_values(array_values($new_arr)[$key])[$count]."<br>";
        if(array_values(array_values($new_arr)[$key])[$count] == "RADIATORDIRECT") {
            $new_arr['BASIC INCOME'] += '...';
        }

        $count++;
    }

我需要的数组将如下所示:

Array
(
    [0] => Array
        (
            [DEPARTMENT] => LEAFSPRINGDIRECT
            [BASIC INCOME] => 3035.37
            [OT PAY] => 0
        )

    [1] => Array
        (
            [DEPARTMENT] => MUFFLERDIRECT
            [BASIC INCOME] => 39044.17‬
            [OT PAY] => 8607.16‬
        )
)

我怎么才能做得更容易呢？先谢谢你.