Imagine a framework as a website construction kit:
Controller:This is the
'manager',receiving requests and directing tasks.It decides which view to display and how.
Action:Each action is aspecific job within
the project,like building the main page or a blog post.For example,
Model:Model,
representing the data and business logic of the application.,
View:This is thecontentthat
gets displayed to the user.It's like theindividual building blockssuch as text,images,and forms.
Layout:This is thearchitectural
blueprintof the website.It defines theoverall structureandstyle,including where different elements go and how they look.Think of it as athemethat sets the foundation for the entire website.
Here's the construction process:
Setting the Foundation:
The controller first chooses apredefined layoutfor the page,similar to picking athemefor the website.
this->layout->set_layout('default');sets the default layout (theme) for the
views in this controller.
This theme includes not just the layout,but alsostylesheets(defining the visual appearance) andJavaScript files(adding interactive elements).
Defining the Tasks:
When a user requests a specific page,the controlleractivatesthe corresponding
action.
For example,indexActionis the action responsible for the homepage,while another action might build a contact form page.
Gathering Materials:
The action gathers all the necessarydatato display the content,akin to collecting the specificbuilding materialsneeded for that page.
Building the Content:
The gathered information is then used torenderthe specificviewneeded for that page,similar to constructing the actual content blocks.
Assembling the Page:
The rendered view,containing the specific content,is thenintegratedinto the
chosen layout (theme).
Imagine putting the finished building blocks into their designated spaces within the overall website
structure defined by the theme.
Presenting the Masterpiece:
Finally,thecompleted page,combining layout,view,styles,and scripts,is sent to the user's browser for them to see.
MVC is a software architecture that allows for the separation of business logic from the user interface. In this architecture, the user sees and interacts
with the view that, in the case of Web applications, is generated HTML code (along with JavaScript, CSS, images, etc.)
User actions are passed (as HTTP requests, GET or POST methods) to the controller. The controller is a piece of
code that handles and processes user input and then reads and makes necessary changes to the model, which is responsible for the storage and
modification of data. (In simple terms, the model consists of the database structure and contents, and the code used to access it.) Then, the controller
generates the proper view that will be sent and displayed to user.