3v4l.org

run code in 300+ PHP versions simultaneously
<?php interface A { function foo(int $a); } class B implements A { function foo(int $a, int $b) { } }
Output for 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.19, 8.3.0 - 8.3.7
Fatal error: Declaration of B::foo(int $a, int $b) must be compatible with A::foo(int $a) in /in/hPPZ5 on line 8
Process exited with code 255.
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33
Fatal error: Declaration of B::foo(int $a, int $b) must be compatible with A::foo(int $a) in /in/hPPZ5 on line 7
Process exited with code 255.
Output for 5.5.24 - 5.5.35, 5.6.8 - 5.6.21
Fatal error: Declaration of B::foo() must be compatible with A::foo(int $a) in /in/hPPZ5 on line 7
Process exited with code 255.

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