3v4l.org

run code in 300+ PHP versions simultaneously
<?php namespace V1 { interface Foo { public function merge(Foo $foo); } } namespace V2 { interface Foo extends \V1\Foo { } } namespace { class FooImpl implements \V2\Foo { public function merge(\V1\Foo $foo) { // ... } } $fooImpl1 = new FooImpl; $fooImpl2 = new FooImpl; $fooImpl1->merge($fooImpl2); }
Output for 5.5.0 - 5.5.38, 5.6.0 - 5.6.38, 7.0.0 - 7.0.33, 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 - 8.1.28, 8.2.0 - 8.2.19, 8.3.0 - 8.3.7
preferences:
230.93 ms | 404 KiB | 295 Q