3v4l.org

run code in 500+ PHP versions simultaneously
<?php class ParentClass { function foo(string $arg): string {} } class ChildClass extends ParentClass { // typehints are missing function foo($arg) {} }
Output for 7.1.25 - 7.1.33, 7.2.0 - 7.2.34, 7.3.0 - 7.3.2
Fatal error: Declaration of ChildClass::foo($arg) must be compatible with ParentClass::foo(string $arg): string in /in/Tg6Rr on line 15
Process exited with code 255.
Output for 8.3.5
Fatal error: Declaration of ChildClass::foo($arg) must be compatible with ParentClass::foo(string $arg): string in /in/Tg6Rr on line 13
Process exited with code 255.
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