3v4l.org

run code in 300+ PHP versions simultaneously
<?php $arrays = [[0,"A" => 176000], [0, "b" => 500], [0, 3960000, 200], [10, 500, 200]]; foreach($arrays as $sub){ foreach($sub as $key => $num){ if(!isset($new[$key])) $new[$key] =0; $new[$key] += $num; } } var_dump($new);
Output for 5.6.38, 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.26, 8.4.1 - 8.4.13
array(5) { [0]=> int(10) ["A"]=> int(176000) ["b"]=> int(500) [1]=> int(3960500) [2]=> int(400) }
preferences:
363.58 ms | 408 KiB | 5 Q