In a usual scenario involving models in PHP, you will have some repeating things: You will usually need getters and setters for the model’s properties, you will need to be able to construct the model from an SQL query or such, and you’ll also need to write SQL queries for the models.
While none of this is very complex, it’s something that you need to repeat all the time, and it’s not really something that actually does anything complex. So why not automate at least some of it?