3v4l.org

run code in 300+ PHP versions simultaneously
<?php $masterArray = [ [ 'GB' => 20827, 'US' => 73, 'ES' => 23 ], [ 'GB' => 15070, 'US' => 3920 ] ]; $final = []; foreach($masterArray as $subArray) { foreach($subArray AS $key => $value) { $final[$key] = isset($final[$key]) ? $final[$key] + $value : $value; } } print_r($final);
Output for 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.34, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.19, 8.3.0 - 8.3.7
Array ( [GB] => 35897 [US] => 3993 [ES] => 23 )
preferences:
190.88 ms | 404 KiB | 339 Q