<?php
namespace Alpha
{
	class Foo
	{
		public function test() {}
	}
}

namespace Beta
{
	use Alpha as NamespaceAlias;
	use Alpha\Foo as ClassAlias;

	class TestClass
	{
		public function methodA()
		{
			return new \Alpha\Foo();
		}

		public function methodB()
		{
			return new ClassAlias;
		}

		public function methodC()
		{
			return new NamespaceAlias\Foo();
		}
	}

	$testClass = new TestClass();
	$testClass->methodA()->test(); // OK
	$testClass->methodB()->test(); // OK
	$testClass->methodC()->test(); // OK
}

namespace Gamma
{
	class Child extends \Beta\TestClass {}

	$child = new Child();
	$child->methodA()->test(); // OK
	$child->methodB()->test(); // fails
	$child->methodC()->test(); // fails
}