3v4l.org

run code in 500+ PHP versions simultaneously
<?php class x { function foo(int $a, int $b) {} } class y extends x { function foo(int $b, int $a) {} } class x2 { function foo(int $a, string $b) {} } class y2 extends x2 { function foo(string $b, int $a) {} }
Output for 8.5.0 - 8.5.3
Fatal error: Declaration of y2::foo(string $b, int $a) must be compatible with x2::foo(int $a, string $b) in /in/qKEbO on line 7 Stack trace: #0 {main}
Process exited with code 255.
Output for 8.3.0 - 8.3.30, 8.4.1 - 8.4.18
Fatal error: Declaration of y2::foo(string $b, int $a) must be compatible with x2::foo(int $a, string $b) in /in/qKEbO on line 7
Process exited with code 255.
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