3v4l.org

run code in 300+ PHP versions simultaneously
<?php error_reporting(-1); $myarray['lol']['rofl']['foo'] = 10; var_dump($myarray);
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, 5.5.0 - 5.5.38, 5.6.0 - 5.6.30, 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 - 7.4.30, 8.0.0 - 8.0.20, 8.1.0 - 8.1.7
array(1) { ["lol"]=> array(1) { ["rofl"]=> array(1) { ["foo"]=> int(10) } } }

preferences:
60.18 ms | 412 KiB | 5 Q