3v4l.org

run code in 300+ PHP versions simultaneously
<?php class A { function foo() { } } class B extends A { function foo(WTF $x = null) { print __METHOD__; } } (new B)->foo();
Output for 8.4.1 - 8.4.18, 8.5.0 - 8.5.3
Deprecated: B::foo(): Implicitly marking parameter $x as nullable is deprecated, the explicit nullable type must be used instead in /in/dBHeg on line 10 B::foo
Output for 7.1.0 - 7.1.25, 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 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30
B::foo
preferences:
101.71 ms | 1432 KiB | 4 Q