MVCL pattern, code flow and request & response in OpenCart defined

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#opencart tutorial: How #MVCL works? This Opencart developer guides Code flow and request & response in OpenCart defined easily.
OpenCart handles each request with simple pattern of URL requested
Incoming requests are interpreted by the routing URL “route=“ and passed to controller class method matching the URL route part which perform business logics, loads respective data to returns Response objects to view.
Each requested URL “route=” helps on finding respective folder and then controller file.
The routing system determines which Controller class method will be executed based on information from the request and routing URL you've passed.
The term controller is a word you'll hear a lot, regardless of the language or framework you use. It refers simply to the area of your code that processes user input and prepares the response.
Returns the appropriate Response object.


As described in “OpenCart theme and Module development” book, it says “OpenCart is an e-commerce shopping cart application built with its own in-house framework which uses MVCL (Model, view, controller and language) pattern. Thus, each module in OpenCart also follows the MVCL pattern. The controller creates logic and gathers data from the model and it passes data to display in the view.”
User request to the controller through website URL,
controller loads the language and set the variable for any text used in the data.
If data is needed from the database controller loads the model, ask for result and model send back results, then controller set results to data.
All these data are sent to View which renders and show the output

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