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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.
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Introduction
CodeIgniter 3 Installation
Quiz - Introduction to CodeIgniter
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).
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What is MVC (Model-View-Controller)?
Controllers
Views
Models
Remove index.php from URL using .htaccess
Include header and footer
Sessions
The Session class allows you to maintain a user’s "state" and track their activity while they browse your site.
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CodeIgniter – Session
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:
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CodeIgniter – URI Routing
Forms and Input
Forms provide a way for users to interact with the application and submit data.
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CodeIgniter – Forms and Input
Composer
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.
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Composer
Security
You can enable CSRF protection by modifying your application/config/config.php file
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Cross-site request forgery (CSRF)
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.
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CodeIgniter – Connect to Database
CodeIgniter – Insert data
CodeIgniter – Retrieve data
CodeIgniter – Update data
CodeIgniter – Delete data
Example
Sign in, Send an email and Upload a file
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CodeIgniter – Sign up with email and password
CodeIgniter – Login with email and password
CodeIgniter – Change password
CodeIgniter – File upload
CodeIgniter – Login with OTP
CodeIgniter – Image to DATA URIs
CodeIgniter – Generate PDF
CodeIgniter – Send email
CodeIgniter – Dynamic Table
AJAX Example
Insert and Update Operations
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CodeIgniter – Insert data AJAX
CodeIgniter – Update data AJAX
CodeIgniter – Uploading a File with AJAX
DataTable
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.
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CodeIgniter – DataTables Server-side
Spreadsheet
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.
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CodeIgniter – Import data from Spreadsheet
Payment Gateway
Razorpay and PayTM Payment Gateway
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CodeIgniter – Razorpay integration
CodeIgniter – PayTM integration
Chatbot
WhatsApp Chatbot and Telegram Chatbot
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CodeIgniter – Telegram Chatbot
CodeIgniter – WhatsApp Chatbot
CodeIgniter Tutorial

Forms provide a way for users to interact with the application and submit data.

HTML is easy to understand and write, but CodeIgniter makes things even easier. CodeIgniter has built-in functions to build HTML forms.

$this->load->helper('form');

The following table shows the CodeIgniter functions for HTML tags:

No.HTMLCodeIgniter
1
<form>
<?php 
echo form_open('action', 'attributes'); 
?>
2
</form>
<?php 
echo form_close(); 
?>
3
<form enctype="multipart/form-data">
<?php 
echo form_open_multipart('action', 'attributes'); 
?>
4
<input type="text">
<?php 
echo form_input(["type"=>"text"]); 
?>
5
<input type="hidden">
<?php 
echo form_input(["type"=>"hidden"]); 
?>
6
<textarea></textarea>
<?php 
echo form_textarea(["name"=>"textarea"]); 
?>
7
<select></select>
<?php 
$array = ["data"=>"Data"];
echo form_dropdown(["name"=>"textarea","options"=>$array]); 
?>
8
<select multiple></select>
<?php 
$array = ["data"=>"Data"];
echo form_multiselect(["name"=>"textarea","options"=>$array]); 
?>
9
<input type="submit" />
<?php 
echo form_button(["type"=>"submit", "value"=>"Submit"]); 
?>

Example

<!DOCTYPE html>
<html lang="en">

<head>
	<title>Form in CodeIgniter</title>
	<meta charset="utf-8">
	<meta name="viewport" content="width=device-width, initial-scale=1">
	<link rel="stylesheet" 
	href="https://maxcdn.bootstrapcdn.com/bootstrap/4.5.0/css/bootstrap.min.css">
	<script 
	src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js">
	</script>
	<script 
	src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.16.0/umd/popper.min.js">
	</script>
	<script 
	src="https://maxcdn.bootstrapcdn.com/bootstrap/4.5.0/js/bootstrap.min.js">
	</script>
</head>

<body>
	<div class="container">
		<div class="row">
			<div class="col-sm-12">
				<?php 
				$attr = 'method="post"';
				echo form_open('contacts/add', $attr);
				?>
					<div class="form-group">
						<label for="name">Name:</label>
						<?php echo form_input(["type"=>"text", 
						"name"=>"name", 
						"id"=>"name", 
						"class"=>"form-control"]); ?>
					</div>
					<div class="form-group">
						<label for="email">Email:</label>
						<?php echo form_input(["type"=>"email", 
						"name"=>"email", 
						"id"=>"email", 
						"class"=>"form-control"]); ?>
					</div>
					<div class="form-group">
						<label for="country">Country:</label>
						<?php
						$country = ["India"=>"India", "US"=>"USA"];
						echo form_dropdown(["name"=>"country", 
						"id"=>"country", 
						"options"=>$country, 
						"class"=>"form-control"]);
						?>
					</div>
					<div class="form-group">
						<?php echo form_button(["type"=>"submit", 
						"name"=>"submit"
						, 
						"id"=>"submit", "class"=>"btn btn-primary", 
						"content"=>"Submit"]); ?>
					</div>
				</form>
			</div>
		</div>
	</div>
</body>
</html>
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