3v4l.org

run code in 300+ PHP versions simultaneously
<?php $x = ["a", "b", "c", "d", "e"]; var_export( array_merge( ...array_fill(0, 2, $x) ) );
Output for 8.0.1 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.3
array ( 0 => 'a', 1 => 'b', 2 => 'c', 3 => 'd', 4 => 'e', 5 => 'a', 6 => 'b', 7 => 'c', 8 => 'd', 9 => 'e', )
preferences:
73.24 ms | 1116 KiB | 4 Q