3v4l.org

run code in 500+ PHP versions simultaneously
<?php define('undefined', null); function my_function($hello = 123) { var_dump($hello); } my_function(null); // > null my_function(undefined); // > 123 my_function($v);
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.3
NULL NULL Warning: Undefined variable $v in /in/SblIZ on line 12 NULL
Output for 5.0.4 - 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 - 5.6.40, 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
NULL NULL Notice: Undefined variable: v in /in/SblIZ on line 12 NULL
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.3
NULL NULL Notice: Undefined variable: v in /in/SblIZ on line 12 NULL
preferences:
45.49 ms | 2698 KiB | 4 Q