3v4l.org

run code in 300+ PHP versions simultaneously
<?php $array1 = array(1 => '1',2 => '2',3 => '3',4 => '4'); $array2 = array(1 => '1',2 => '2',5 => '5',6 => '6'); $array3 = $array1 + $array2; print_r($array3);
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 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 - 7.2.33, 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 - 8.2.18, 8.3.0 - 8.3.6
Array ( [1] => 1 [2] => 2 [3] => 3 [4] => 4 [5] => 5 [6] => 6 )
preferences:
337.55 ms | 406 KiB | 460 Q