3v4l.org

run code in 300+ PHP versions simultaneously
<?php $hw = array(72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33); print_r($hw);
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.7 - 5.6.28, 7.0.0 - 7.0.20, 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 - 8.2.18, 8.3.0 - 8.3.6
Array ( [0] => 72 [1] => 101 [2] => 108 [3] => 108 [4] => 111 [5] => 32 [6] => 87 [7] => 111 [8] => 114 [9] => 108 [10] => 100 [11] => 33 )

preferences:
197.2 ms | 406 KiB | 329 Q