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CodeIgniter is a very famous and most relevant framework among PHP developers. It’s very fast and simple in comparison to another framework that is used in PHP also with less file size.

So till now CodeIgniter 3 was used to develop the projects in PHP and now CodeIgniter 4 has been officially released for use in the projects in PHP. Through this blog, we will understand the main differences between CodeIgniter 3 and CodeIgniter 4.

The main differences are:

  • The difference in downloads
  • The difference in the namespace
  • The difference in compatibility
  • The difference in application structure
  • The difference in controllers
  • The difference in Models
  • The difference in views
  • The difference in libraries

What Are The Differences In Downloads Of Codeigniter 3 And Codeigniter 4

Usually, CodeIgniter 4 can be downloaded by two methods. The first is to use the composer and the second is to use a ready-run zip file from the CodeIgniter official website. CodeIgniter 3 can be downloaded in only one way.

What Are The Difference Between Using Namespaces Of Codeigniter 3 And Codeigniter 4

Ok, Let’s discuss this Codeigniter 4 is built for PHP 7.2+ versions. So it says that it is built for the main latest version of PHP. and everything in this latest version of the framework is namespaced, except for the helpers.CodeIgniter 3 is not used namespace.

What Are The Difference Between The Compatibility Of Codeigniter 3 And Codeigniter 4

It is not compatible with CodeIgniter 3. so if you want to use CodeIgniter 4 then definitely you have to give some more effort to update the version that you using now. because in the CodeIgniter 4 it was very easy to update but in this update, they have added a lot of new variety of features that are the reason it’s not compatible with the CodeIgniter 3.

What Are The Difference Between The Application Structure Of Codeigniter 3 And Codeigniter 4

  • The folder of the application is renamed as an app and the framework is still in system folders, with the same interpretation as before.
  • The framework that provides for a public folder, it intended as the document root for your app
  • There will be a writable folder, to catch cache data, logs, and session data
  • Now there is no nested application because now in CI4 there is a different mechanism to extend the framework component.

What Are The Difference Between Controllers Of Codeigniter 3 And Codeigniter 4

  • In Codeigniter 4, You have to extend Controller instead of CI_Controller that used.
  • In this version, they do not use any constructor to use the magic. now it is the part of the base controller which you will make a great change.
  • The new thing is that Codeigniter 4 provides a Request and Response object to work. It’s more powerful than the Codeigniter 3 way.
  • If you want to use your controller as a Base Controller then make your controller anywhere you like and extend Controller and then use it anywhere you want.

What Are The Difference Between The Models Of Codeigniter 3 And Codeigniter 4

  • The model will not extend the CI model you have to extend the Model
  • In the Codeigniter 4 model, there are more functionalities than Codeigniter 3 including automatic database connection, basic CRUD, in-model validation and automatic pagination.
  • Instead of writing in Codeigniter 3 $this->load->model(x) now you have to write $this->x = new X():
  • Codeigniter 4 has Entity class also to use richer data mapping to database tables;

What Are The Difference Between Views Of Codeigniter 3 And Codeigniter 4

  • Instead of writing in Codeigniter 3 $this->load->view(x) you can use echo view(x);
  • Codeigniter 4 supports view cells to build your response in pieces

One of the main benefits of CodeIgniter framework development is that you can take a simple approach. Here you can easily use the PHP frameworks in order to build a software solution. The proponents of this system are quite simple to use. The interface is also pretty easy – this means that web development can be done in a seamless manner. Airo global software is one of the best web development company in Kerala that can give you quality products and give you the best support.

If you have any doubts about the above topic or have to get services and consultations about app development and other digital solutions. Feel free to contact us. AIRO GLOBAL SOFTWARE will be your strong digital partner. E-mail id: [email protected]

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Author - Johnson Augustine
Chief Technical Director and Programmer
Founder: Airo Global Software Inc
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