3v4l.org

run code in 300+ PHP versions simultaneously
<?php trait C { private static $FOO = self::NAME . ' FOO'; } class D { use C; const NAME = 'D'; } class E { use C; const NAME = 'E'; } var_dump(D::$FOO); var_dump(E::$FOO);
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
Fatal error: Uncaught Error: Cannot access private property D::$FOO in /in/69Ttp:17 Stack trace: #0 {main} thrown in /in/69Ttp on line 17
Process exited with code 255.
Output for 5.6.7 - 5.6.28
Fatal error: Cannot access private property D::$FOO in /in/69Ttp on line 17
Process exited with code 255.
Output for 5.4.2 - 5.4.45, 5.5.24 - 5.5.35
Parse error: syntax error, unexpected '.', expecting ',' or ';' in /in/69Ttp on line 4
Process exited with code 255.

preferences:
220.17 ms | 401 KiB | 238 Q