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This article mainly explains "what is the CodeIgniter framework". The content in the article is simple and clear, and it is easy to learn and understand. Please follow the editor's train of thought to study and learn "what is the CodeIgniter framework".

CodeIgniter is an application framework

1. Free: CodeIgniter is licensed under the Apache/BSD-style open source license, and you can use it if you like.

2. Simple: CodeIgniter is really lightweight, and the core system only needs some very small libraries.

3. MVC:CodeIgniter uses the method of MVC, which can better separate the presentation layer from the logic layer.

-- Application flow chart

As a front-end controller, index.php initializes the basic resources needed to run CodeIgniter. Router examines the HTTP request to determine who will process the request. If the Cache file exists, it will bypass the usual system execution order and be sent directly to the browser. Security (Security). Before the application controller (Application Controller) loads, the HTTP request and any data submitted by the user will be filtered. The controller (Controller) loads the model, core libraries, helper functions, and any other resources needed to process specific requests. The final view (View) renders what is sent to the Web browser. If Caching is turned on, the view is cached first, so it will be available for future requests. Model-View-Controller

CodeIgniter is based on the model-view-controller design pattern. MVC is a way to separate the logical layer from the presentation layer of an application. In practice, because the presentation layer is separated from PHP scripts, it allows your web pages to contain very few scripts.

The Model represents your data structure. Generally speaking, your model class will include the functions of fetching, inserting, and updating your database.

A View is the information that is presented to the user. A view is usually a web page, but in CodeIgniter, a view can also be a page fragment, such as the header and footer. It can also be a RSS page, or any other type of "page".

The controller (Controller) is an intermediary between models, views, and any other resources necessary to process HTTP requests, and generates web pages.

CodeIgniter is very loose in using MVC, so the model is not required. If you don't need to use this separation, or if you find that the maintenance model is much more complex than you think, you can ignore them and create your own application, minimizing the use of controllers and views. CodeIgniter can also be used in conjunction with your existing scripts, or allow you to develop your own core libraries of the system, allowing you to work in a way that works best for you.

Thank you for your reading, the above is the content of "what is the CodeIgniter framework", after the study of this article, I believe you have a deeper understanding of what is the CodeIgniter framework, and the specific use needs to be verified in practice. Here is, the editor will push for you more related knowledge points of the article, welcome to follow!

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