3v4l.org

run code in 300+ PHP versions simultaneously
<?php class A{ const FOO = 10; } class A1 extends A{ const FOO = 20; // no error. WAT } interface B{ const FOO = 10; } interface B1 extends B{ const FOO = 20; // error. WAT }
Output for 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Output for 5.4.7 - 5.4.45, 5.5.24 - 5.5.35, 5.6.7 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30
Fatal error: Cannot inherit previously-inherited or override constant FOO from interface B in /in/s0vmE on line 15
Process exited with code 255.
preferences:
237.2 ms | 403 KiB | 265 Q