3v4l.org

run code in 300+ PHP versions simultaneously
<?php abstract class Foo{ abstract static function xxx(stdClass $a); } abstract class Bar extends Foo{ abstract static function xxx($a): stdClass; } class Baz extends Bar{ static function xxx($a): stdClass{} }
Output for 7.2.29 - 7.2.33, 7.3.16 - 7.3.33, 7.4.3 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.25, 8.4.1 - 8.4.12
Output for 7.0.0 - 7.0.17, 7.1.0 - 7.1.3
Fatal error: Can't inherit abstract function Foo::xxx() (previously declared abstract in Bar) in /in/q72RG on line 9
Process exited with code 255.
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160.86 ms | 407 KiB | 5 Q