3v4l.org

run code in 300+ PHP versions simultaneously
<?php $foo = function () { return [['a'], ['b'], ['c']]; }; $bar = function () { return [['a'], ['b'], ['c']]; }; var_dump(array_merge( ...$foo(), ...$bar() ));
Output for 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 - 8.1.30, 8.2.0 - 8.2.24, 8.3.0 - 8.3.12
array(6) { [0]=> string(1) "a" [1]=> string(1) "b" [2]=> string(1) "c" [3]=> string(1) "a" [4]=> string(1) "b" [5]=> string(1) "c" }
preferences:
82.74 ms | 408 KiB | 5 Q