3v4l.org

run code in 300+ PHP versions simultaneously
<?php interface I { public function example($a, $b, $c); } class A implements I { public function example($a, $b = null, $c = null): int { } } class B extends A { public function example($a, $b, $c = null): string { } } ?>
Output for 8.0.0 - 8.0.8
Fatal error: Declaration of B::example($a, $b, $c = null): string must be compatible with A::example($a, $b = null, $c = null): int in /in/gl1Gt on line 10
Process exited with code 255.
Output for 7.4.0 - 7.4.22
Fatal error: Declaration of B::example($a, $b, $c = NULL): string must be compatible with A::example($a, $b = NULL, $c = NULL): int in /in/gl1Gt on line 10
Process exited with code 255.
Output for 7.2.0 - 7.2.33, 7.3.16 - 7.3.29
Fatal error: Declaration of B::example($a, $b, $c = NULL): string must be compatible with A::example($a, $b = NULL, $c = NULL): int in /in/gl1Gt on line 9
Process exited with code 255.
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.20

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