3v4l.org

run code in 500+ 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, $c = null): string { } } ?>
Output for 7.0.0 - 7.0.33, 7.1.0 - 7.1.20
Output for 7.2.0 - 7.2.34, 7.3.0 - 7.3.33
Fatal error: Declaration of B::example($a, $b, $c = NULL): string must be compatible with A::example($a, $b = NULL, $c = NULL): int in /in/gl1Gt on line 9
Output for 7.4.0 - 7.4.33
Fatal error: Declaration of B::example($a, $b, $c = NULL): string must be compatible with A::example($a, $b = NULL, $c = NULL): int in /in/gl1Gt on line 10
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.34, 8.3.0 - 8.3.35, 8.4.1 - 8.4.26
Fatal error: Declaration of B::example($a, $b, $c = null): string must be compatible with A::example($a, $b = null, $c = null): int in /in/gl1Gt on line 10
Output for 8.5.0 - 8.5.11
Fatal error: Declaration of B::example($a, $b, $c = null): string must be compatible with A::example($a, $b = null, $c = null): int in /in/gl1Gt on line 10 Stack trace: #0 {main}
preferences:
35.58 ms | 1150 KiB | 15 Q