3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a = [[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]; print_r($a);
Output for 7.0.20, 7.1.6 - 7.1.20, 7.2.6 - 7.2.33, 7.3.12 - 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] => Array ( [0] => Array ( [0] => Array ( [0] => Array ( [0] => Array ( [0] => Array ( [0] => Array ( [0] => Array ( [0] => Array ( [0] => Array ( [0] => Array ( [0] => Array ( [0] => Array ( [0] => Array ( [0] => Array ( [0] => Array ( [0] => Array ( [0] => Array ( [0] => Array ( [0] => Array ( [0] => Array ( [0] => Array ( [0] => Array ( [0] => Array ( [0] => Array ( [0] => Array ( [0] => Array ( [0] => Array ( [0] => Array ( [0] => Array ( [0] => Array ( [0] => Array ( [0] => Array ( [0] => Array ( [0] => Array ( [0] => Array ( [0] => Array ( [0] => Array ( [0] => Array ( [0] => Array ( [0] => Array ( [0] => Array ( [0] => Array ( [0] => Array ( [0] => Array ( [0] => Array ( [0] => Array ( [0] => Array ( [0] => Array ( [0] => Array ( [0] => Array ( [0] => Array ( [0] => Array ( [0] => Array ( [0] => Array ( [0] => Array ( [0] => Array ( [0] => Array ( [0] => Array ( [0] => Array ( [0] => Array ( [0] => Array ( [0] => Array
Process exited with code 137.
Output for 7.1.5

Process exited with code 137.
preferences:
280.49 ms | 401 KiB | 149 Q