3v4l.org

run code in 300+ PHP versions simultaneously
<?php namespace derp { class Foo {} } namespace herp { class BetterFoo extends \derp\Foo {} class Derp { public function __construct(DerpFoo $foo) {} } class_alias('DerpFoo', '\derp\Foo'); $f = new Derp(new BetterFoo); }

preferences:
28.8 ms | 402 KiB | 5 Q