Simple MVC base Login Form in PHP

This tutorial is about MVC in PHP Login form. MVC is a Model View Controller pattern. This pattern is very commonly used today in the programming.
Model: Model manage the data, it stores and retrieve the data usually from the data base.
View: View represent the data in the required format.
Controller: it is handle the Model and View layer. Controller take the request from the client send to Model for  operation and then send the required output to View.
Now let start to create the simple login form in php using MVC pattern.