Learn Codeigniter - 1 Code Examples & CST Typing Practice Test

CodeIgniter is a powerful PHP framework with a small footprint, designed for developers who need a simple and elegant toolkit to build full-featured web applications quickly.

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CodeIgniter Simple Counter App

Learn CODEIGNITER with Real Code Examples

Updated Nov 27, 2025

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Code Sample Descriptions

CodeIgniter Simple Counter App

<?php

// application/controllers/Counter.php
class Counter extends CI_Controller {
    public function __construct() {
        parent::__construct();
        $this->load->library('session');
        if (!$this->session->has_userdata('count')) {
        $this->session->set_userdata('count', 0);
        }
    }

    public function index() {
        $count = $this->session->userdata('count');
        echo "<h2>Counter: $count</h2>";
        echo "<form method='post' action='/counter/increment'><button type='submit'>+</button></form>";
        echo "<form method='post' action='/counter/decrement'><button type='submit'>-</button></form>";
        echo "<form method='post' action='/counter/reset'><button type='submit'>Reset</button></form>";
    }

    public function increment() {
        $count = $this->session->userdata('count') + 1;
        $this->session->set_userdata('count', $count);
        redirect('/counter');
    }

    public function decrement() {
        $count = $this->session->userdata('count') - 1;
        $this->session->set_userdata('count', $count);
        redirect('/counter');
    }

    public function reset() {
        $this->session->set_userdata('count', 0);
        redirect('/counter');
    }
}

Demonstrates a simple CodeIgniter controller and routes for a counter using session for state persistence.

Let’s Try →

Frequently Asked Questions about Codeigniter

What is Codeigniter?

CodeIgniter is a powerful PHP framework with a small footprint, designed for developers who need a simple and elegant toolkit to build full-featured web applications quickly.

What are the primary use cases for Codeigniter?

Developing custom PHP web applications. Creating RESTful APIs quickly. Rapid prototyping for startups. Building internal enterprise tools and dashboards. Integrating with third-party APIs or legacy systems

What are the strengths of Codeigniter?

Extremely lightweight and easy to deploy. Simple learning curve for beginners. Highly flexible and extendable. Well-documented and mature framework. Suitable for both small and medium projects

What are the limitations of Codeigniter?

Not as feature-rich as Laravel or Symfony. Smaller community compared to newer PHP frameworks. Limited built-in ORM capabilities. Less modern tooling for advanced PHP practices. Not ideal for large-scale enterprise applications with complex architecture

How can I practice Codeigniter typing speed?

CodeSpeedTest offers 1+ real Codeigniter code examples for typing practice. You can measure your WPM, track accuracy, and improve your coding speed with guided exercises.

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Code Sample Descriptions

CodeIgniter Simple Counter App

<?php

// application/controllers/Counter.php
class Counter extends CI_Controller {
    public function __construct() {
        parent::__construct();
        $this->load->library('session');
        if (!$this->session->has_userdata('count')) {
        $this->session->set_userdata('count', 0);
        }
    }

    public function index() {
        $count = $this->session->userdata('count');
        echo "<h2>Counter: $count</h2>";
        echo "<form method='post' action='/counter/increment'><button type='submit'>+</button></form>";
        echo "<form method='post' action='/counter/decrement'><button type='submit'>-</button></form>";
        echo "<form method='post' action='/counter/reset'><button type='submit'>Reset</button></form>";
    }

    public function increment() {
        $count = $this->session->userdata('count') + 1;
        $this->session->set_userdata('count', $count);
        redirect('/counter');
    }

    public function decrement() {
        $count = $this->session->userdata('count') - 1;
        $this->session->set_userdata('count', $count);
        redirect('/counter');
    }

    public function reset() {
        $this->session->set_userdata('count', 0);
        redirect('/counter');
    }
}

Demonstrates a simple CodeIgniter controller and routes for a counter using session for state persistence.

Let’s Try →

Frequently Asked Questions about Codeigniter

What is Codeigniter?

CodeIgniter is a powerful PHP framework with a small footprint, designed for developers who need a simple and elegant toolkit to build full-featured web applications quickly.

What are the primary use cases for Codeigniter?

What are the strengths of Codeigniter?

Extremely lightweight and easy to deploy. Simple learning curve for beginners. Highly flexible and extendable. Well-documented and mature framework. Suitable for both small and medium projects

What are the limitations of Codeigniter?

How can I practice Codeigniter typing speed?

CodeSpeedTest offers 1+ real Codeigniter code examples for typing practice. You can measure your WPM, track accuracy, and improve your coding speed with guided exercises.