3v4l.org

run code in 300+ PHP versions simultaneously
<?php abstract class A{ /** * @return A */ abstract function bar(): A; } abstract class B extends A{ /** * @return B */ abstract function bar(): A; } class C extends B{ /** * @return C */ function bar(): A{ return $this; } }
Output for 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.27, 8.4.1 - 8.4.14
Output for 7.0.0 - 7.0.33, 7.1.0 - 7.1.33
Fatal error: Can't inherit abstract function A::bar() (previously declared abstract in B) in /in/pdDHE on line 15
Process exited with code 255.
Output for 5.5.0 - 5.5.38, 5.6.0 - 5.6.40
Parse error: syntax error, unexpected ':', expecting ';' or '{' in /in/pdDHE on line 7
Process exited with code 255.
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124.42 ms | 408 KiB | 5 Q