3v4l.org

run code in 300+ PHP versions simultaneously
<?php interface A { function test(): A; } class B implements A { public function test(): B { } } (new B())->test();
Output for 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
Fatal error: Uncaught TypeError: B::test(): Return value must be of type B, none returned in /in/pEPcj:10 Stack trace: #0 /in/pEPcj(13): B->test() #1 {main} thrown in /in/pEPcj on line 10
Process exited with code 255.
Output for 7.4.0 - 7.4.33
Fatal error: Uncaught TypeError: Return value of B::test() must be an instance of B, none returned in /in/pEPcj:10 Stack trace: #0 /in/pEPcj(13): B->test() #1 {main} thrown in /in/pEPcj on line 10
Process exited with code 255.
Output for 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33
Fatal error: Declaration of B::test(): B must be compatible with A::test(): A in /in/pEPcj on line 7
Process exited with code 255.
Output for 5.6.0 - 5.6.40
Parse error: syntax error, unexpected ':', expecting ';' or '{' in /in/pEPcj on line 4
Process exited with code 255.

preferences:
97.82 ms | 1976 KiB | 4 Q