3v4l.org

run code in 300+ PHP versions simultaneously
<?php interface truc { const OK = 'OK'; } final class A implements truc { } class B extends A { const OK = 'PAS OK'; } echo B::OK;
Output for 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Fatal error: Class B cannot extend final class A in /in/uFaFC on line 12
Process exited with code 255.
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30
Fatal error: Class B may not inherit from final class (A) in /in/uFaFC on line 12
Process exited with code 255.
Output for 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.28
Fatal error: Class B may not inherit from final class (A) in /in/uFaFC on line 13
Process exited with code 255.
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189.92 ms | 402 KiB | 274 Q