3v4l.org

run code in 300+ PHP versions simultaneously
<?php class Foo extends Exception { protected string $file = ''; }
Output for 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
Output for 7.4.0 - 7.4.33, 8.0.1 - 8.0.30
Fatal error: Type of Foo::$file must not be defined (as in class Exception) in /in/edBKq on line 6
Process exited with code 255.
preferences:
219.07 ms | 1395 KiB | 119 Q