3v4l.org

run code in 300+ PHP versions simultaneously
<?php namespace Waffles; abstract class A { const FOO = self::FOO; const OTHER = 0; private $waf = self::OTHER; } class B extends A { const FOO = 'waffles'; } $foo = new B(); echo $foo::FOO;
Output for 5.6.0 - 5.6.40, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.25, 8.4.1 - 8.4.12
waffles
Output for 8.0.0 - 8.0.30
Fatal error: Uncaught Error: Cannot declare self-referencing constant self::FOO in /in/3aIHb:19 Stack trace: #0 {main} thrown in /in/3aIHb on line 19
Process exited with code 255.
Output for 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.34, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33
Fatal error: Uncaught Error: Cannot declare self-referencing constant 'self::FOO' in /in/3aIHb:19 Stack trace: #0 {main} thrown in /in/3aIHb on line 19
Process exited with code 255.
preferences:
125.08 ms | 409 KiB | 5 Q