3v4l.org

run code in 300+ PHP versions simultaneously
<?php $sys = 0; $admin = 1; $right = 123; $a = []; var_export($right !== $sys && $a[$admin] ?? null);
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
Warning: Undefined array key 1 in /in/4VQtn on line 7 false
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.16 - 7.3.31, 7.4.0 - 7.4.25, 7.4.27 - 7.4.33
Notice: Undefined offset: 1 in /in/4VQtn on line 7 false
Output for 7.3.32 - 7.3.33, 7.4.26
false

preferences:
155.87 ms | 401 KiB | 169 Q