3v4l.org

run code in 300+ PHP versions simultaneously
<?php $test = ['a', 'b','c']; $blah = ['c', 'd']; $a = $test + $blah; var_dump($a);
Output for 5.6.38, 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 - 8.2.19, 8.3.0 - 8.3.7
array(3) { [0]=> string(1) "a" [1]=> string(1) "b" [2]=> string(1) "c" }
preferences:
173.67 ms | 404 KiB | 247 Q