3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a = [1, 2, 3]; $b = [0 => [4], 1 => [5]]; $t = $a + $b; var_dump($t); var_dump(array_merge($a, $b[1]));
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 - 7.2.33, 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 - 8.3.7
array(3) { [0]=> int(1) [1]=> int(2) [2]=> int(3) } array(4) { [0]=> int(1) [1]=> int(2) [2]=> int(3) [3]=> int(5) }
preferences:
197.03 ms | 404 KiB | 331 Q