Basic of Codeigniter

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Speaker:

PANKA

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Our Agenda

What is CodeIgniter ?

What makes CodeIgniter a smart framework to use?

Why MVC?

Routing Basics

Installation and Configuration

Model View Controller

Template Integration

Template Engine

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What is CodeIgniter ?

A proven, agile & open PHP web application framework

Enables developers to build web applications faster

Offers many helpful code libraries and helpers

Based on MVC design pattern

Developed by EllisLab

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What makes CodeIgniter a smart framework?

Exceptional performance

MVC approach to development

Generates search engine friendly clean URLs

Easily extensible

Runs on both PHP 4 (4.3.2+) and 5

Support for most major databases including MySQL (4.1+), MySQLi, MS SQL, Postgres, Oracle, SQLite, a

Application security is a focus

Easy caching operations

Many libraries and helpers to help you with complex operations such as email, image manipulation,fo

Most libraries are only loaded when needed which cuts back on resources needed

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Why MVC?

MVC stands for Model, View, Controller

Model: The model deals with the raw data and

database interaction. Component is not required and

can be included in the controller.

View: The view deals with displaying the data and

interface controls to the user.

Controller: The controller acts as the in between of

view and model.The controller is the place to load

libraries and helpers.

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Routing Basics

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Installation

and

Configuratio

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Download CodeIgniter

Download CodeIgniter and upload it to your server.

http://ellislab.com/codeigniter/download

All you need to do is unzip and upload it to your PHP and MySQL enabled server.

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CI Directory Structure

The application directory contains model,view,controller,helper,library and so on.

The system directory is the core and consists of the core framework files. When a new version is relea

your existing application just by replacing this system directory with the latest release.

The user_guidehouses the user guide to CI.

The index.phpfile is the bit that does all the CI magic.

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The cachefolder stores all the caches generated by the caching library.

This configdirectory includes settings/configuration related information like database settings, route i

The core directoryneeded to extend the functionality of core classes like controller,loader,router etc.

The errors folder stores all the template error pages for the application.

The helpers folder stores all the helpers which are specific to your application like email, imageMagick

The hooks folder is for hooks which modify the functioning of CIs core files.

The language folder stores lines of text which can be loaded through the language library to create mu

The libraries folder stores all the libraries which are specific to your application. The third_partydirectory will include library files, but only those, which are imported from third-party

Application Directory Structure

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The database folder stores all the database drivers and class which enable you to connect to database

The fontsfolder stores all the fonts which can be used by the image manipulation library.

The helpersfolder stores all of CIs core helpers but you can place your own helpers in here which can

of your applications.

The language folder stores all of CIs core language files which its libraries and helpers use.

The libraries folder stores all of CIs core libraries but you can place your own libraries.

System Directory Structure

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Configuration

Need to set upbase_url.

To do this, open up system/application/config/config.php

Need to set up databaseTo use a database, open up system/application/config/database.php

Add database to the autoloTo do this, open up system/app

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Testing CodeIgniter

Cong

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Model

View

Controller

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What is a controller?

A Controller is simply a class file that is named in a way that can be associated with a URI.

http://localhost/news_system/index.php/newsHere CI will find news.phpController

class News extends CI_Controller {

public function __construct()

{

parent::__construct();

$this->load->model('news_model');

}

public function index()

{

$data['news'] = $this->news_model->get_news();

$data['title'] = 'News archive';

$this->load->view('templates/header', $data);

$this->load->view('news/index', $data);

$this->load->view('templates/footer');

}

}

Let's create a simple news controller so you can see it in action. Then save the file news.phpto applicatio

Class names must start with an

uppercase letter.

Important Note:

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Passing URI segments to function

http://localhost/news_system/index.php/news/view/initializing-the-class

class News extend

public fu

{

}

}

CI allow to pass more than one segments

function name

Class ConstructorsIf you intend to use a constructor in Controllers, MUSTplace

parent::__construct();

Constructors are useful if you need to set some default values, or run

a default process when your class is instantiated.

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What is a Model?

Models are PHP classes that are designed to work with information in your database.

Basic prototype for News model class:

class News_model extends CI_Model {

public function __construct()

{

$this->load->database();

}

}

Class names must have the first

letter capitalized

File name will be lower case version

of class name i.e news_model.php

ImportantNote

Loading a Model

$this->load->model('Model_name');

Use a Model

$this->Model_name

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Active Record Class

CodeIgniter uses a modified version of the Active Record Database Pattern.

Pattern allows information to be retrieved, inserted, and updatedin your database with minimal scrip

A major benefit to using the Active Recordfeatures is that it allows you to create database independe

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Build SQL Select statement

$query = $this->db->get('mytable');

// Produces: SELECT * FROM mytable

The second and third parameters enable you to set a limit and offset clause:

$query = $this->db->get('mytable', 10, 20);

// Produces: SELECT * FROM mytable LIMIT 20, 10

$query = $this->db->get_where('mytable', array('id' => $id), $limit, $offset);// Produces: SELECT * FROM mytable where id=$id LIMIT $offset, $limit

$this->db->select('title, content, date');

$query = $this->db->get('mytable');

// Produces: SELECT title, content, date FROM mytable

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$this->db->select_max('age', 'member_age');

$query = $this->db->get('members');// Produces: SELECT MAX(age) as member_age FROM members

$this->db->order_by('title desc, name asc');

// Produces: ORDER BY title DESC, name ASC

$names = array('Frank', 'Todd', 'James');

$this->db->where_in('username', $names);

// Produces: WHERE username IN ('Frank', 'Todd', 'James')

Build SQL Select statement

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$data = array( 'title' => 'My title' , 'name' => 'My Name' , 'date' => 'My date');

$this->db->insert('mytable', $data);// Produces: INSERT INTO mytable (title, name, date) VALUES ('My title', 'My name', 'My date')

$this->db->set('name', $name);

$this->db->insert('mytable');

// Produces: INSERT INTO mytable (name) VALUES ('{$name}')

OR

$array = array('name' => $name);

$this->db->set($array);

$this->db->insert('mytable');

//You can also pass an associative array to this function

Build SQL Insert statement

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$data = array('title' => $title,'name' => $name,'date' => $date);

$this->db->where('id', $id);

$this->db->update('mytable', $data);

// Produces:

// UPDATE mytable SET title = '{$title}', name = '{$name}', date = '{$date}' WHERE id = $id

$data = array(

array('title' => 'My title','name' => 'My Name 2' ,'date' => 'My date 2' ),

array('title' => 'Another title' ,'name' => 'Another Name 2' ,'date' => 'Another date 2' )

);

$this->db->update_batch('mytable', $data, 'title');

// Produces:

// UPDATE `mytable` SET `name` = CASE WHEN `title` = 'My title' THEN 'My Name 2' WHEN `title` = 'Another title' THEN 'An

`name` END, `date` = CASE WHEN `title` = 'My title' THEN 'My date 2' WHEN `title` = 'Another title' THEN 'Another date 2'

`title` IN ('My title','Another title')

Build SQL Update statement

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$this->db->delete('mytable', array('id' => $id));

// Produces:// DELETE FROM mytable WHERE id = $id

$this->db->from('mytable');

$this->db->truncate();

// or

$this->db->truncate('mytable');

// Produce:

// TRUNCATE mytable

Build SQL Delete statement

Note: If the TRUNCATE command isn't

available, truncate() will execute as "DELETE

FROM table".

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What is View?

A view is a web page, or a page fragment, like a header, footer, sidebar,

etc.

Views are never called directly, they must be loaded by a controller

Loading a View

$this->load->view('name');

My Blog

Welcome to

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Helper

Helpers means help you with tasks.

Each helper file is simply a collection of functions or methods.

Stored in your system/helpers, or application/helpers directory

Few common Helpers are listed below:

URL Helpers, that assist in creating links

Form Helpersthat help you create form elements

Text Helpersperform various text formatting routines

Cookie Helpersset and read cookies

File Helpershelp you deal with files

Loading a Helper

$this->load->he

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Template Integra


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Where we put css/js/imagedirectory ?

Local CI Directory news_system

Configure base_url& define one more variable BASE_URITo do this, open up system/application/config/config.php

Directory structure of project news_system

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Create templates directory

Create atemplatesdirectoryTo do this, open up application/views/

Create header.php& footer.phpfiles in templates directory

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Link to css/js/images

For cssdirectory


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Testing of template integration

Cong

ratul

ation

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nteg

ratedt

empla

tesu

c

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Template Engi


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Template Engine

Template Parser Class enables you to parse pseudo-variables contained within

your view files.

Initializing the Class

Initialized in your controller

$this->load->library(parser);

Pass data to view using $this->parser->parse()

Method accepts a template name and data array as input

$data=array( news_title=>My News, news_heading=>My News heading);

$this->parser->parse(news_template,$data);

The Template Parser Class is

template parsing solution.

{news_title}


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