43146542 Codeigniter Intro

8/8/2019 43146542 Codeigniter Intro

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Introduction ToIntroduction ToCodeIgniterCodeIgniter


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PrerequisitePrerequisite

OOP Object OrientedProgrammingPHPMySQL


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IndexIndexIntroduction

Evolution Of Web DevelopmentBasic Idea Of Web FrameworkWhy Framework not Scratch?MVC ( Model View Controller) ArchitectureWhat is CodeIgniter ????

Installation of CodeIgniterApplication Flow of CodeIgniterCodeIgniter URLControllersViewsModels

CodeIgniter LibrariesHelpers

A Basic Application Development Of CodeigniterApplication Flow

Q/AReference


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Evolution of WebEvolution of WebDevelopmentDevelopment

How you first started buildingHow you first started buildingwebsites.websites.


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How youre building websitesHow youre building websitesnow.now.


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How you build websites with aHow you build websites with aframeworkframework


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Basic Idea Of WebBasic Idea Of WebFrameworkFrameworkA web application framework

Is a Software frameworkDesigned to support the development of

Dynamic websitesWeb applicationsWeb services

Aims to alleviate the overhead associated with common activities usedin Web development.

Libraries for database accessTemplating frameworksSession managementOften promote code reuseMany more .


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Why Framework NotWhy Framework NotScratch ?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


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MVC ArchitectureMVC ArchitectureSeparates User Interface From Business LogicModel - Encapsulates core application data and functionality BusinessLogic.View - obtains data from the model and presents it to the user.Controller - receives and translates input to requests on the model orthe view

Figure : 01


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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


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Installation of CodeIgniterInstallation of CodeIgniterRequirments

Web Server - Download & Install ApachePHP 4.3.2 or HigherDatabase MySQL ( support for other DB exists )

InstallationDownload the latest version from www.codeigniter.com and unzip into your webroot directory.Open application/config/config.php and change base_url value to base url. Forexample: 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
http://www.codeigniter.com/http://localhot/mycihttp://localhot/mycihttp://www.codeigniter.com/


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Application Flow Of Application Flow Of CodeIgniterCodeIgniter

Figure : 2 [ Application Flow of CodeIgniter]


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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


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ControllersControllersA Class file resides under application/controllerswww.your-site.com/index.php/ first

// Output Will be Hello CUET!!

Note: Class names must start with an Uppercase Letter.

In case of constructor you must use parent::Controller();


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ControllersControllersIn This Particular Code

// 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 secondsegment in the URL


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VIEWSVIEWSA Webpage or A page FragmentShould be placed under application/viewsNever Called Directly

My First CodeIgniter Project

Welcome ALL To My .. ::: First Project ::: .

. .

web_root/myci/system/application/views/myview.php

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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);

}

..::Personal Info::..

Full Name :
E-mail :


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VIEWSVIEWSThere are 3 mechanism that can be utilize to show Dynamic Data inside aVIEW File

- Pure PHP- PHPs Alternative Syntax- CodeIgniters Template Engine

For This

For That

What

Note: There are other alternative syntax for, foreach, while


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ModelsModelsDesigned to work with Information of DatabaseModels Should be placed Under application/models/

Loading a Model inside a Controller

$this->load->model(mymodel);$data = $this->mymodel->get_info();


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CodeIgniter LibrariesCodeIgniter Libraries

Benchmarking Database Encryption Calendaring

FTP Table File Uploading Email

Image Manipulation Pagination Input and Security HTML

Trackback Parser Session TemplateUnit Testing User Agent URI Validation

Special Purpose Classes

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

Loading CodeIgniter Library


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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 .
;

}

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 .
;

}

Active Record Pattern

General Approach


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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) );


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HelpersHelpersForm Helper

form_open()form_open_multipart()form_input()form_textarea()form_checkbox()form_submit()form_close()

URL Helpersite_url()base_url()

anchor()anchor_popup()mailto()


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A Personal Blog Using CIA Personal Blog Using CI


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Questions???Questions???

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