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<?php namespace Concrete\Test { use DerpFoo; class Test { public function __construct(Concrete\Foo\FooInterface $foo) {} } $f = new Test(new \Concrete\BetterFoo\BetterFoo); } namespace Concrete\Foo { class Foo implements FooInterface { public function Derp(); } interface FooInterface { public function Derp(); } class_alias('\Concrete\Foo\Foo', 'DerpFoo'); } namespace Concrete\BetterFoo { class BetterFoo extends \Concrete\Foo\Foo implements FooInterface {} }