3v4l.org

run code in 300+ PHP versions simultaneously
<?php class A { function foo():A { } function bar(B $b) { } } class B extends A { function foo():B { } function bar(A $b) { } }
Output for 7.4.4 - 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, 8.4.1 - 8.4.18, 8.5.0 - 8.5.3
Output for 7.1.0 - 7.1.17, 7.2.0 - 7.2.33, 7.3.16 - 7.3.33
Fatal error: Declaration of B::foo(): B must be compatible with A::foo(): A in /in/AiNlJ on line 21
Process exited with code 255.
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106.92 ms | 1384 KiB | 4 Q