use is_subclass_of() instead of class_implements()
use is_subclass_of() instead of class_implements()

ruden/oscommerce2,scottcwilson/oscommerce2,osCommerce/oscommerce2,scottcwilson/oscommerce2,osCommerce/oscommerce2,osc2nuke/oscommerce2,haraldpdl/oscommerce2,osc2nuke/oscommerce2,haraldpdl/oscommerce2,ruden/oscommerce2