3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a1=array("red","green"); $a2=array("blue","yellow"); print_r(array_merge($a1,$a2)); ?>
Output for 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.34, 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 - 8.2.18, 8.3.0 - 8.3.7
Array ( [0] => red [1] => green [2] => blue [3] => yellow )
preferences:
279.81 ms | 405 KiB | 416 Q