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()

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 Slideshare

Introduction To Code Igniter

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