CodeIgniter Download 3: A Guide for Web Developers
CodeIgniter is a powerful PHP framework that provides a simple and elegant toolkit to create full-featured web applications. It is one of the most popular and widely used PHP frameworks in the world, thanks to its speed, light weight, ease of use, and security. In this article, we will show you how to download and install CodeIgniter 3, the legacy version of the framework that is still in maintenance mode. We will also explain some of the main features and benefits of using CodeIgniter for web development.
What is CodeIgniter and why use it for web development?
CodeIgniter is an open-source web framework that was created by EllisLab in 2006 and is now a project of the British Columbia Institute of Technology. It follows the Model-View-Controller (MVC) architecture, which separates the logic, presentation, and data layers of an application. This makes the code more organized, reusable, and maintainable.
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CodeIgniter has many advantages over other PHP frameworks, such as:
It has a small footprint (about 2 MB) and does not require any additional libraries or dependencies.
It has a very fast performance and low memory usage, thanks to its optimized core and minimal configuration.
It has a clear and comprehensive documentation that covers every aspect of the framework.
It has a large and active community that provides support, feedback, and contributions.
It has a rich set of built-in libraries and helpers that facilitate common tasks such as database access, form validation, email sending, image manipulation, file uploading, pagination, encryption, caching, etc.
It has a flexible URI routing system that allows for search-engine friendly URLs and custom controllers.
It has a strong security system that protects against CSRF and XSS attacks, as well as provides data encryption and session management.
It has a simple and intuitive syntax that simplifies PHP coding and streamlines web development.
CodeIgniter Download 3
CodeIgniter 3 is the legacy version of the framework that is intended for use with PHP 5.6 or higher. It was released in March 2015 and is currently at version 3.1.13. It is still supported by the developers with security updates, but no new features are added. CodeIgniter 3 is suitable for developers who want to use a stable and proven framework that works on most hosting platforms.
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CodeIgniter 4 is the latest version of the framework that is intended for use with PHP 7.4 or higher. It was released in February 2020 and is currently at version 4.1.5. It is a complete rewrite of the framework that introduces many new features and improvements, such as:
A modern codebase that follows PHP standards and best practices.
A modular structure that allows for easy customization and extension.
A powerful CLI tool that enables scaffolding, testing, migration, etc.
A built-in testing suite that supports PHPUnit and Codeception.
A PSR-4 compliant autoloader that supports namespaces and composer packages.
A dependency injection container that manages class dependencies.
A query builder database layer that supports multiple connections and drivers.
A view parser that supports template engines such as Twig.
An event system that triggers actions based on events.
CodeIgniter 4 is suitable for developers who want to use a modern and cutting-edge framework that leverages the latest features of PHP.
To download and install CodeIgniter 3, you have two options: manually or using Composer.
Manual Download and Installation
To download and install CodeIgniter 3 manually, follow these steps:
Go to the official CodeIgniter website and click on the Download button. You will be redirected to a page where you can choose between CodeIgniter 3 and CodeIgniter 4. Click on the Download CodeIgniter 3 button and save the zip file to your computer.
Extract the zip file to a folder of your choice. You will see a folder named CodeIgniter-3.1.13 (or the latest version) that contains all the files and folders of the framework.
Upload the CodeIgniter folder to your web server or localhost. You can rename the folder to anything you want, such as ci3 or myapp.
Open your web browser and navigate to the URL of your CodeIgniter folder. You should see a welcome page that confirms that your installation is successful.
Download and Installation Using Composer
To download and install CodeIgniter 3 using Composer, follow these steps:
Make sure you have Composer installed on your computer. If not, you can download it from the official Composer website and follow the installation instructions.
Create a new project folder on your computer and open a terminal or command prompt window in that folder.
Type the following command to create a new CodeIgniter 3 project using Composer: composer create-project codeigniter/framework:3.* ci3. This will download and install the latest version of CodeIgniter 3 in a folder named ci3 (or any name you choose).
Upload the ci3 folder to your web server or localhost.
Open your web browser and navigate to the URL of your ci3 folder. You should see a welcome page that confirms that your installation is successful.
How to run and test your CodeIgniter 3 application?
Once you have downloaded and installed CodeIgniter 3, you can start developing your web application using the framework. To run and test your application, you need to do the following:
Create your controllers, models, views, libraries, helpers, etc. in the appropriate folders inside the application folder of your CodeIgniter project.
Configure your application settings, such as base URL, database connection, encryption key, etc. in the config folder of your application folder.
Navigate to the URL of your application and see the output of your code. You can also use tools such as Xdebug or PHPUnit to debug and test your code.
Conclusion
In this article, we have shown you how to download and install CodeIgniter 3, the legacy version of the popular PHP framework. We have also explained some of the main features and benefits of using CodeIgniter for web development. We hope you have found this article helpful and informative. If you want to learn more about CodeIgniter, you can visit the following resources:
The official CodeIgniter website:
The official CodeIgniter documentation:
The official CodeIgniter forum:
The official CodeIgniter GitHub repository:
The official CodeIgniter YouTube channel:
Frequently Asked Questions
What is the difference between CodeIgniter 3 and CodeIgniter 4?
CodeIgniter 3 is the legacy version of the framework that is intended for use with PHP 5.6 or higher. It is still supported by the developers with security updates, but no new features are added. CodeIgniter 4 is the latest version of the framework that is intended for use with PHP 7.4 or higher. It is a complete rewrite of the framework that introduces many new features and improvements.
How do I update from CodeIgniter 3 to CodeIgniter 4?
There is no direct upgrade path from CodeIgniter 3 to CodeIgniter 4, as they are very different frameworks. You will need to rewrite your application code to follow the new structure and syntax of CodeIgniter 4. You can use the official upgrade guide to help you with the migration process:
How do I create a database connection in CodeIgniter 3?
To create a database connection in CodeIgniter 3, you need to edit the database.php file in the config folder of your application folder. You can specify your database settings, such as hostname, username, password, database name, driver, etc. in this file. You can also create multiple database connections and switch between them as needed. To load the database library and access the database object, you can use the following code in your controller or model: $this->load->database(); and $this->db;.
How do I use helpers and libraries in CodeIgniter 3?
Helpers and libraries are additional components that provide useful functions and features for your application. Helpers are collections of standalone functions that perform common tasks, such as working with arrays, dates, forms, URLs, etc. Libraries are classes that encapsulate complex logic and functionality, such as email sending, image manipulation, file uploading, encryption, etc. To use helpers and libraries in CodeIgniter 3, you need to load them first using the following code in your controller or model: $this->load->helper('helper_name'); and $this->load->library('library_name');. You can then call the helper functions or library methods using their names.
How do I create a custom controller or model in CodeIgniter 3?
To create a custom controller or model in CodeIgniter 3, you need to create a new PHP file in the controllers or models folder of your application folder. The file name should match the class name of your controller or model. The class name should start with an uppercase letter and extend the CI_Controller or CI_Model class. For example, to create a custom controller named MyController, you can use the following code: <?php defined('BASEPATH') OR exit('No direct script access allowed'); class MyController extends CI_Controller public function index() // Your code here ?>
How do I use views and templates in CodeIgniter 3?
Views are files that contain the HTML output of your application. They are usually stored in the views folder of your application folder. You can create multiple views for different parts of your application, such as header, footer, sidebar, content, etc. To load a view in your controller, you can use the following code: $this->load->view('view_name');. You can also pass data from your controller to your view using an associative array as the second parameter: $data = array('title' => 'Hello World', 'message' => 'This is a test'); $this->load->view('view_name', $data);. You can then access the data in your view using the array keys as variables: <h1><?php echo $title; ?></h1> <p><?php echo $message; ?></p>.
Templates are files that contain a common layout or structure for your views. They are usually stored in the views folder of your application folder as well. To use a template in your application, you can create a master view that loads the template and passes the content view as a variable: <?php $this->load->view('template', array('content' => 'content_view')); ?>. You can then include the content view in your template using the following code: <?php $this->load->view($content); ?>.
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