ok ahora me salta el siguiente erro:
Fatal error: main() [<a href='function.main'>function.main</a>]: The script tried to execute a method or access a property of an incomplete object. Please ensure that the class definition "carrito" of the object you are trying to operate on was loaded _before_ unserialize() gets called or provide a __autoload() function to load the class definition in C:\wamp\www\Basilico\administrador\mete_producto.p hp on line 5
gracias!