3v4l.org

run code in 300+ PHP versions simultaneously
<?php abstract class MarkupDocument {} class Html5Document extends MarkupDocument {} class ParentClass { public ?MarkupDocument $doc; } class ChildClass extends ParentClass { public ?Html5Document $doc; }
Output for 8.1.0 - 8.1.23, 8.2.0 - 8.2.10
Fatal error: Type of ChildClass::$doc must be ?MarkupDocument (as in class ParentClass) in /in/El7Ve on line 11
Process exited with code 255.
Output for 8.0.1 - 8.0.30
Fatal error: Type of ChildClass::$doc must be ?MarkupDocument (as in class ParentClass) in /in/El7Ve on line 13
Process exited with code 255.
preferences:
153.39 ms | 1399 KiB | 71 Q