3v4l.org

run code in 300+ PHP versions simultaneously
<?php $first = array('one','two','one'); $second = array(10,5,30); $third = array(); foreach($first as $k => $v){ if(isset($third[$v])) $third[$v] += $second[$k]; else $third[$v] = $second[$k]; } print_r($third);
Output for 5.5.0 - 5.5.36, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.16 - 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 ( [one] => 40 [two] => 5 )
preferences:
223.13 ms | 404 KiB | 217 Q