3v4l.org

run code in 300+ PHP versions simultaneously
<?php const FOO = ['a', 'b', 'c']; var_dump(isset(FOO[1]));
Output for 7.0.0 - 7.0.32, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
bool(true)
Output for 5.6.0 - 5.6.38
Fatal error: Cannot use isset() on the result of an expression (you can use "null !== expression" instead) in /in/EimZP on line 4
Process exited with code 255.
Output for 5.5.0 - 5.5.38
Fatal error: Arrays are not allowed as constants in /in/EimZP on line 2
Process exited with code 255.

preferences:
215.6 ms | 401 KiB | 319 Q