3v4l.org

run code in 300+ PHP versions simultaneously
<?php trait T { abstract function foo($bar); } class R { use T; function foo($bar, $baz) {} }
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.30, 8.2.0 - 8.2.25, 8.3.0 - 8.3.14, 8.4.1
Fatal error: Declaration of R::foo($bar, $baz) must be compatible with T::foo($bar) in /in/2pERT on line 9
Process exited with code 255.
Output for 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
preferences:
76.78 ms | 411 KiB | 6 Q