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Introduction To Introduction To CodeIgniterCodeIgniter
Mohammad Amzad HossainSoftwork [email protected]
PrerequisitePrerequisite
OOP – Object Oriented Programming
PHPMySQL
IndexIndex 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 Evolution of Web DevelopmentDevelopment
How you first started building How you first started building websites.websites.
Evolution of Web Evolution of Web DevelopmentDevelopment
How you’re building websites How you’re building websites now.now.
Evolution of Web Evolution of Web DevelopmentDevelopment
How you build websites with a How you build websites with a frameworkframework
Basic Idea Of Web Basic Idea Of Web FrameworkFrameworkA 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 Why Framework Not Scratch ? 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 ArchitectureMVC 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 ???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 CodeIgniterInstallation 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 Application Flow Of CodeIgniterCodeIgniter
Figure : 2 [ Application Flow of CodeIgniter]
CodeIgniter URLCodeIgniter URLURL in CodeIgniter is Segment Based.
www.your-site.com/news/article/my_article
Segments in a URI
www.your-site.com/class/function/ID
CodeIgniter Optionally Supports Query String URL
www.your-site.com/index.php?c=news&m=article&ID=345
ControllersControllersA 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();”
ControllersControllersIn 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
VIEWSVIEWS 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
16
VIEWSVIEWSCalling a VIEW from Controller
$this->load->view(‘myview’);
Data Passing to a VIEW from Controller
function index() {$var = array(
‘full_name’ => ‘Amzad Hossain’,‘email’ => ‘[email protected]’
);$this->load->view(‘myview’, $var);
}
<html><title> ..::Personal Info::.. </title><body>Full Name : <?php echo $full_name;?> <br />E-mail : <?=email;?> <br /></body></html>
VIEWSVIEWSThere 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’s Alternative Syntax -->
<?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’
ModelsModelsDesigned to work with Information of Database
Models Should be placed Under “application/models/”
<?php
class Mymodel extend Model{function Mymodel() {
parent::Model();}function get_info() {
$query = $this->db->get(‘name’, 10); /*Using ActiveRecord*/return $query->result();
}}?>
Loading a Model inside a Controller
$this->load->model(‘mymodel’);$data = $this->mymodel->get_info();
CodeIgniter LibrariesCodeIgniter Libraries
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
Special Purpose Classes
$this->load->library(‘database’);
Loading CodeIgniter Library
CodeIgniter LibrariesCodeIgniter LibrariesDatabase LibraryAbstract Database Class support traditional structures and Active Record Pattern.
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 />”;
}
Active Record Pattern
General Approach
HelpersHelpersSimply a collection of functions in a particular category.
Array Date File HTML Smiley Text
URL Cookie Download Form Security String
Directory E-mail Inflector XML Parser Typography
$this->load->helper(‘helper_name’);
Loading A Helper Inside a Controller
$this->load->helper(array(‘form’,’url’) );
HelpersHelpersForm 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 CIA Personal Blog Using CI
Questions & Questions & AnswersAnswers
Useful Links www.codeigniter.com http://codeigniter.com/wiki/Summary_of_Resources_Li
braries_Helpers_Plugins.../
ReferenceReference User Guide of CodeIgniter 1.6.1 Wikipedia PHPit Slideshare