In the other PHP Frame like codeigniter, it will have library or helper. I can define my own functions by using library and helper. For instance, I can create a user function named generate_code(). I can use my function all over the application. If I want to modify the business logic of code generatioin, I just need to change one function. I am the beginner of Phalcon and I cannot find this kind of support. Could you please guide me? Thanks.