What is CodeIgniter? How does it Work?

With a very small footprint, CodeIgniter is a powerful PHP framework, designed for developers who 
need an elegant and simple toolkit to build entire web applications. To build a web application, you spend 
a lot of time writing the same code over and over again. Frameworks give you a start block and minimize 
the amount of code needed to build a website.

CodeIgniter is a PHP driven framework, but it is not a PHP replacement. Diving in CodeIgniter does 
not mean leaving PHP behind. CodeIgniter contains simple interface, libraries, and logical structure to 
access these libraries, plug-ins, helpers and some other resources that more easily solve the complex 
functions of PHP while maintaining high performance. It simplifies the PHP code and releases a fully 
interactive, dynamic website in a much shorter time. It supports MySQL version 4.1 or newer and PHP 
version of 5.2.6 or newer. It makes your website more robust and your code easier to read and maintain. 
It is a free toolkit, lightweight, simple to use and easier to install.

The person using CodeIgniter should be familiar with PHP. You must have a good knowledge of PHP, 
such as the basic syntax and how it works with database and HTML.

CodeIgniter Features

Let's see some of the features that make CodeIgniter great. The following list is not exhaustive but gives 
you an idea of what to expect when working with CodeIgniter.

Small footprint: The full source code for the CodeIgniter framework is almost 2 MB. This makes it 
easy to master CodeIgniter and how it works. It also simplifies implementation and updating.

Strong security: CodeIgniter take security seriously, with built-in protection against XSS and CSRF 
attacks. Version 4 adds context-sensitive escape and CSP

Almost zero configuration: Much of the CodeIgniter configuration is done by convention, such as 
placing models in a "models" folder. A number of configuration options are still available via scripts in 
the "config" folder.

Lightning-fast: Users prefer applications that load very quickly. If you have worked with some of the 
modern frameworks, you will realize that they need less than a second to load after installation. 
CodeIgniter, you can load less than 50 ms on average. The extra time spent on optimizing, such as 
in a different framework, is released when working with CodeIgniter.

Loosely connected: The built-in functions are designed to work independently without relying too 
much on other components. This makes maintenance and upgrades easy.

MVC architecture: The framework uses the architectural design of Model-View-Controller. It is an 
industry-standard when working with web applications. MVC separates data, business logic, and 
presentation.

Excellent documentation: The framework is well documented and there are good books, tutorials 
and answered forum questions on CodeIgniter. This means whatever challenge you have, chances are 
that someone has already encountered the problem, solved it and the solution is for you.

Application-specific built-in components: CodeIgniter has components for sending an email, 
database management, session management and much more as you will discover while we continue 
with the tutorials.

Extendable: CodeIgniter comes with a few libraries and helpers from the box. If what you want is not 
there or if you want to implement an existing function your way. Then you can easily do this by creating 
your libraries, helpers, packages, etc.

Short learning curve: CodeIgniter is easy to control for anyone who is already familiar with PHP. 
Within a very short time, the student can start to develop professional applications with the help of 
CodeIgniter.

How CodeIgniter Works?

CodeIgniter is an MVC framework. MVC stands for Model View Controller. When a user asks 
for a source, the controller responds first. The controller understands the user request and, if necessary, 
requests the necessary data.

For example, if you want to retrieve a customer with id = 3, the controller receives your request and then 
asks the model to retrieve the record with the ID of 3. The model returns the record to the controller. The 
controller then forwards the result to the display in which it is converted into a human-readable format. 
The results are then sent back to the user in the browser.

CodeIgniter Release History

2006:    The first version of CodeIgniter

2009:    ExpressionEngine 2.0 launched

2014:   British Columbia Institute of Technology took ownership of the project

2019:    Stable version 4 expected to launch

Advantages provided by CodeIgniter Developer are –

• CodeIgniter development offers simple and hassle-free migration from a server hosting to server hosting
• Without influencing the adjustment, it helps you to add new functionalities
• The development of CodeIgniter offers simple solutions for solving errors.
• Structure and development of the development of CodeIgniter is simple
• CodeIgniter development offers flexibility and easy management
• Offers easy configuration of files
• CodeIgniter development is easy to understand and expand
• It has a large and active user community
• CodeIgniter is easy to use and adapt
• CodeIgniter framework is good for startup
• It is light in weight

CodeIgniter frameworks is mostly used in PHP to know more knowledge about CodeIgniter

frameworks go through PHP Training in Chandigarh.