3v4l.org

run code in 300+ PHP versions simultaneously
<?php $x = []; array_unshift($x, 'a'); array_unshift($x, 'b'); array_unshift($x, 'c'); var_dump($x);
Output for 8.1.0 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.29, 8.4.1 - 8.4.16, 8.5.0 - 8.5.1
array(3) { [0]=> string(1) "c" [1]=> string(1) "b" [2]=> string(1) "a" }
preferences:
89.85 ms | 406 KiB | 5 Q