3v4l.org

run code in 300+ PHP versions simultaneously
<?php /** * @legacy */ interface A { function foo(); } /** * Supersedes legacy interface A */ interface B extends A { /** * @param int|null $x * Optional parameter added in new version. */ # function foo($x = NULL); } class C implements B { function foo($x = NULL) {} }
Output for 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 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, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
preferences:
263.15 ms | 405 KiB | 414 Q