Course Content
Introduction to CodeIgniter
CodeIgniter is a powerful PHP framework built for developers who need a simple and elegant toolkit to create full-featured web applications.
MVC (Model-View-Controller)
MVC stands for Model-View-Controller. MVC is an application design model consisting of three interconnected parts. They include the model (data), the view (user interface), and the controller (processes that handle input).
The Session class allows you to maintain a user’s "state" and track their activity while they browse your site.
URI Routing
There is a one-to-one relationship between a URL string and its corresponding controller class/method. The segments in a URI normally follow this pattern:
Forms and Input
Forms provide a way for users to interact with the application and submit data.
Composer is dependency manager in PHP. it allows you to declare the libraries your project depends on and it will manage (install/update) them for you.
You can enable CSRF protection by modifying your application/config/config.php file
Working with Database
Like any other framework, we need to interact with the database very often and CodeIgniter makes this job easy for us. It provides a rich set of functionalities to interact with the database.
DataTables is a table enhancing plug-in for the jQuery Javascript library that helps in adding sorting, paging, and filtering abilities to plain HTML tables with minimal effort. The main goal is to enhance the accessibility of data in normal HTML tables.
PhpSpreadsheet is a PHP library for reading and writing spreadsheet files. Importing Excel and CSV into MySQL help to save the user time and avoid repetitive work.
Payment Gateway
Razorpay and PayTM Payment Gateway
WhatsApp Chatbot and Telegram Chatbot
CodeIgniter 3
About Lesson

For sending Emails in CodeIgniter, we use an external library PHPMailer. By using composer you can download this library into your project.

You need to run the following command in your project’s root directory.


composer require phpmailer/phpmailer

1. Add the following lines in config/config.php

$config['composer_autoload'] = FALSE;
// to
$config['composer_autoload'] = TRUE;

2. Create a controller file Email.php in the applications/controllers/ directory.

defined('BASEPATH') OR exit('No direct script access allowed');
use PHPMailerPHPMailerPHPMailer;
use PHPMailerPHPMailerException;

class Email extends CI_Controller {
    public function __construct() {
    public function compose() {
    public function send_email() {
        $email          = $this->input->post('email');
        $subject        = $this->input->post('subject');
        $message        = $this->input->post('message');
        $mail = new PHPMailer(true);  
		try {
		    $mail->Host         = 'host'; //
		    $mail->SMTPAuth     = true;     
		    $mail->Username     = 'username';  
		    $mail->Password     = 'password';
			$mail->SMTPSecure   = 'tls';  
			$mail->Port         = 587;  
			$mail->Subject      = $subject;
			$mail->Body         = $message;
			$mail->setFrom('username', 'display_name');
			if(!$mail->send()) {
			    echo "Something went wrong. Please try again.";
		    else {
			    echo "Email sent successfully.";
		} catch (Exception $e) {
		    echo "Something went wrong. Please try again.";

3. Create a compose.php file in applications/views/ directory

    action="<?php echo base_url('email/send_email') ?>" 
class="form-horizontal" id="add_email_form"
autocomplete="off" method="post" accept-charset="utf-8"> <div class="form-group"> <label for="inputName" class="col-sm-2 control-label">Recipient Email</label> <div class="col-sm-10"> <input type="hidden" name="id" value="9" id="id" /> <input type="hidden" name="source_id" value="2" id="source_id" /> <input type="text" name="email" value="" id="email" placeholder="Recipient Email Address" class="form-control" required /> </div> </div> <div class="form-group"> <label for="inputName" class="col-sm-2 control-label">Subject</label> <div class="col-sm-10"> <input type="text" name="subject" value="" id="subject" placeholder="Subject" class="form-control" required /> </div> </div> <div class="form-group"> <label for="inputName" class="col-sm-2 control-label">Message</label> <div class="col-sm-10"> <textarea class="form-control" name="message" id="message"></textarea> </div> </div> <div class="form-group"> <div class="col-sm-offset-2 col-sm-10"> <button type="submit" class="btn btn-info">Send Email</button> </div> </div> </form>