3v4l.org

run code in 300+ PHP versions simultaneously
<?php define('NULL','hello world'); $a; if($a==NuLL){ echo 'ok'; }else{ echo 'bad'; } ?>
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Warning: Constant NULL already defined in /in/OutNb on line 2 Warning: Undefined variable $a in /in/OutNb on line 4 ok
Output for 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, 5.6.8 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.10, 7.2.0 - 7.2.33, 7.3.12 - 7.3.31, 7.4.0 - 7.4.25, 7.4.27 - 7.4.33
Notice: Undefined variable: a in /in/OutNb on line 4 ok
Output for 7.3.32 - 7.3.33, 7.4.26
ok
Output for 5.0.4 - 5.0.5
Notice: Undefined variable: a in /in/OutNb on line 3 Notice: Undefined variable: a in /in/OutNb on line 4 ok
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.3
Notice: Undefined variable: a in /in/OutNb on line 3 Notice: Undefined variable: a in /in/OutNb on line 4 ok
preferences:
245.83 ms | 402 KiB | 313 Q