How to use Captcha in CodeIgniter?

In this tutorial, I will show you integrating Captcha in your CodeIgniter application. We gonna use CI’s builtin captcha helper and contains functions that assist in creating CAPTCHA images. This helper needs GD library installed on your server.

How to use Captcha in CodeIgniter

Here are the steps to use Captcha helper in the CodeIgniter 3 application forms:

Download and Install

Step 1: Download from the official website and install CodeIgniter.

Create Controller

Step 2: Lets create a contoller called captcha.php with below code in application/controllers/captcha.php.

The _generateCaptcha() method will generate captcha image and will place generated image inside captcha_images directory as configurated and you must create captcha_images directory in your codeigniter project root directory and change its permission to 777 or 666.

Create a form

Step 2: Crate a View file called captcha_view.php in the applications/views/captcha_view.php

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