ConcreteFactory is a simple factory pattern.

It differs from the static factory because it is NOT static and as you know: static => global => evil!

Therefore, you can have multiple factories, differently parametrized, you can subclass it and you can mock-up it.

You can also find these code on GitHub

ConcreteFactory.php

.. literalinclude:: ConcreteFactory.php
   :language: php
   :linenos:

VehicleInterface.php

.. literalinclude:: VehicleInterface.php
   :language: php
   :linenos:

Bicycle.php

.. literalinclude:: Bicycle.php
   :language: php
   :linenos:

Scooter.php

.. literalinclude:: Scooter.php
   :language: php
   :linenos:

Tests/SimpleFactoryTest.php

.. literalinclude:: Tests/SimpleFactoryTest.php
   :language: php
   :linenos: