Introduction To Code Igniter

Introduction To CodeIgniter Mohammad Amzad Hossain Softwork Solutions [email_address]

Prerequisite
OOP – Object Oriented Programming
PHP
MySQL

Index
Introduction
Evolution Of Web Development
Basic Idea Of Web Framework
Why Framework not Scratch?
MVC ( Model View Controller) Architecture
What is CodeIgniter ????
Installation of CodeIgniter
Application Flow of CodeIgniter
CodeIgniter URL
Controllers
Views
Models
CodeIgniter Libraries
Helpers
A Basic Application Development Of Codeigniter
Application Flow
Q/A
Reference

Evolution of Web Development How you first started building websites.

Evolution of Web Development How you’re building websites now.

Evolution of Web Development How you build websites with a framework

Basic Idea Of Web Framework
A web application framework
Is a Software framework
Designed to support the development of
Dynamic websites
Web applications
Web services
Aims to alleviate the overhead associated with common activities used in Web development.
Libraries for database access
Templating frameworks
Session management
Often promote code reuse
Many more …….

Why Framework Not Scratch ?
Key Factors of a Development
Interface Design
Business Logic
Database Manipulation
User Access Control
Advantage of Framework
Templating
Provide Solutions to Common problems
Abstract Levels of functionality
Make Rapid Development Easier
Disadvantage of Scratch Development
Make your own Abstract Layer
Solve Common Problems Yourself
The more Typing Speed the more faster

MVC Architecture
Separates User Interface From Business Logic
Model - Encapsulates core application data and functionality Business Logic.
View - obtains data from the model and presents it to the user.
Controller - receives and translates input to requests on the model or the view
Figure : 01

What is CodeIgniter ???
An Open Source Web Application Framework
Nearly Zero Configuration
MVC ( Model View Controller ) Architecture
Multiple DB (Database) support
DB Objects
Templating
Caching
Modules
Validation
Rich Sets of Libraries for Commonly Needed Tasks
Has a Clear, Thorough documentation

Installation of CodeIgniter
Requirments
Web Server - Download & Install Apache
PHP – 4.3.2 or Higher
Database – MySQL ( support for other DB exists )
Installation
Download the latest version from www.codeigniter.com and unzip into your web root directory.
Open “application/config/config.php” and change base_url value to base url. For example: http://localhost/myci/
To Use Database open “application/config/database.php” and change necessary values. Usually you have to change: ‘hostname’, ‘username’, ‘password’, ‘datbase’.
Start Your Web Server and Database Server and go to http:// localhot/myci

Application Flow Of CodeIgniter Figure : 2 [ Application Flow of CodeIgniter]

CodeIgniter URL
URL in CodeIgniter is Segment Based.
Segments in a URI CodeIgniter Optionally Supports Query String URL www.your-site.com/ news / article / my_article www.your-site.com/ class / function / ID www.your-site.com/index.php? c=news & m=article & ID=345

Controllers
A Class file resides under “application/controllers”
www.your-site.com/index.php/ first <?php class First extends Controller{ function First() { parent::Controller(); } function index () { echo “<h1> Hello CUET !! </h1> “; } } ?> // Output Will be “Hello CUET!!”
Note:
Class names must start with an Uppercase Letter.
In case of “constructor” you must use “parent::Controller();”

Controllers
In This Particular Code
<?php class First extends Controller{ function index() { echo “<h1> Hello CUET !! </h1> “; } function bdosdn ( $location ) { echo “<h2> Hello $location !! </h2>”; } } ?> // Output Will be “Hello world !!” www.your-site.com/index.php/ first / bdosdn/ world
Note:
The ‘Index’ Function always loads by default. Unless there is a second segment in the URL

VIEWS
A Webpage or A page Fragment
Should be placed under “application/views”
Never Called Directly
<html> <title> My First CodeIgniter Project</title> <body> <h1> Welcome ALL … To My .. ::: First Project ::: . . . </h1> </body> </html> web_root/myci/system/application/views/myview.php

VIEWS
Calling a VIEW from Controller
Data Passing to a VIEW from Controller $this->load->view(‘myview’); function index() { $var = array( ‘ full_name’ => ‘Amzad Hossain’, ‘ email’ => ‘tohi1000@yahoo.com’ ); $this->load->view(‘myview’, $var); } <html> <title> ..::Personal Info::.. </title> <body> Full Name : <?php echo $full_name;?> <br /> E-mail : <?=email;?> <br /> </body> </html>

VIEWS
There are 3 mechanism that can be utilize to show Dynamic Data inside a VIEW File
- Pure PHP
- PHP’s Alternative Syntax
- CodeIgniter’s Template Engine
 <?php if( $for_this == true ):?> <h1> For This </h1> <?php elseif( $for_that == true ): ?> <h1> For That </h1> <?php else: ?> <h1> What </h1> <?php endif; ?>
Note:
There are other alternative syntax ‘for’, ‘foreach’, ‘while’

Models
Designed to work with Information of Database
Models Should be placed Under “application/models/”
Loading a Model inside a Controller <?php class Mymodel extend Model{ function Mymodel() { parent::Model(); } function get_info () { $query = $this->db->get(‘name’, 10); /*Using ActiveRecord*/ return $query->result(); } } ?> $this->load->model(‘mymodel’); $data = $this->mymodel->get_info();

CodeIgniter Libraries Special Purpose Classes Loading CodeIgniter Library Benchmarking Database Encryption Calendaring FTP Table File Uploading Email Image Manipulation Pagination Input and Security HTML Trackback Parser Session Template Unit Testing User Agent URI Validation $this->load->library(‘database’);

CodeIgniter Libraries
Database Library
Abstract Database Class support traditional structures and Active Record Pattern.
Active Record Pattern General Approach function index() { $this->load->library(‘database’); $rslt = $this->db->query (“ select first_name from user_name ”); foreach( $rslt->result() as $row_data) echo $row_data->first_name . “<br />”; } function index() { $this->load->library(‘database’); $this->db->select(“first_name”); $rslt = $this->db->get (“ user_name ”); foreach( $rslt->result() as $row_data) echo $row_data->first_name . “<br />”; }

Helpers
Simply a collection of functions in a particular category.
Loading A Helper Inside a Controller Array Date File HTML Smiley Text URL Cookie Download Form Security String Directory E-mail Inflector XML Parser Typography $this->load->helper(‘helper_name’); $this->load->helper(array(‘form’,’url’) );

Helpers
Form Helper
form_open()
form_open_multipart()
form_input()
form_textarea()
form_checkbox()
form_submit()
form_close()
URL Helper
site_url()
base_url()
anchor()
anchor_popup()
mailto()

A Personal Blog Using CI

Questions & Answers

Useful Links
www.codeigniter.com
http://codeigniter.com/wiki/Summary_of_Resources_Libraries_Helpers_Plugins.../

Reference
User Guide of CodeIgniter 1.6.1
Wikipedia
PHPit
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Introduction To Code Igniter

by Amzad Hossain on Jul 06, 2008

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