3v4l.org

run code in 300+ PHP versions simultaneously
<?php $ar = [1,2,3,3,3,1]; var_dump(array_unique($ar));
Output for 5.5.0 - 5.5.38, 5.6.0 - 5.6.38, 7.0.0 - 7.0.33, 7.1.0 - 7.1.25, 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 - 8.1.28, 8.2.0 - 8.2.19, 8.3.0 - 8.3.7
array(3) { [0]=> int(1) [1]=> int(2) [2]=> int(3) }
preferences:
183.01 ms | 404 KiB | 295 Q