3v4l.org

run code in 300+ PHP versions simultaneously
<?php $foo = ['foo' => 17, 'a', 'bar' => 18, 'b']; $bar = [99 => 'b', 'bar' => 19, 98 => 'c']; $baz = array_merge($foo, $bar); var_dump($baz);
Output for 7.4.0 - 7.4.33, 8.0.1 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.25, 8.4.1 - 8.4.12
array(6) { ["foo"]=> int(17) [0]=> string(1) "a" ["bar"]=> int(19) [1]=> string(1) "b" [2]=> string(1) "b" [3]=> string(1) "c" }
preferences:
107.9 ms | 407 KiB | 5 Q