3v4l.org

run code in 500+ PHP versions simultaneously
<?php interface I { public function a(int $a): string; } Class C implements I { public function a(int|string $a): string { return "foo"; } } function test(I $subject) { print $subject->a('beep'); } test(new C());
Output for 8.1.34, 8.2.0 - 8.2.31, 8.3.0 - 8.3.31, 8.4.1 - 8.4.22, 8.5.0 - 8.5.7
foo

preferences:
40.96 ms | 860 KiB | 4 Q