3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a = array(0 => 1, 1 => 2, 0 => 3); var_dump($a); $x = array(0 => 1, 1 => 2); $y = array(0 => 5, 2 => 3); $z = array_merge($x,$y); var_dump($z);

preferences:
47.74 ms | 402 KiB | 5 Q