3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a = array('a' => 1, 'c' => 3); $b = array('d' => 4, 'b' => 2); print_r(array_merge($a, $b)); print_r($a + $b);

preferences:
34.84 ms | 402 KiB | 5 Q