namespace Name\Space
    {
    class SomeClass
        {
        public function autocomplete(){}
        }

    $object = $this->getObject()->getOtherObject();
    assert($object instanceof SomeClass);
    $object->autocomplete(); // works
    }

namespace Other\Name\Space
    {
    $object = $this->getObject()->getOtherObject();
    assert($object instanceof \Name\Space\SomeClass);
    $object->autocomplete(); // not works
    }

namespace More\Name\Space
    {
    use Name\Space\SomeClass;

    $object1 = $this->getObject()->getOtherObject();
    assert($object1 instanceof \Name\Space\SomeClass);
    $object1->autocomplete(); // works

    $object2 = $this->getObject()->getOtherObject();
    assert($object2 instanceof SomeClass);
    $object2->autocomplete(); // works
    }