What is Codeigniter:-
it is an MVC framework that is used to distribute the code in a layered architecture.
M means Model which is used to provide database connectivity operation.
V means View:- it will contain the design layer of an application using HTML, CSS, JS, and Jquery.
C means Controller:- it will contain the Program Code or Program Logic of an application.
it is a start-up layer of an application.
M means Model which is used to provide database connectivity operation.
V means View:- it will contain the design layer of an application using HTML, CSS, JS, and Jquery.
C means Controller:- it will contain the Program Code or Program Logic of an application.
it is a start-up layer of an application.
MVC is a design pattern to distribute the project on multiple project layers.
The flow of MVC:-
2
1 View
Controller ->
3
Model
means the first controller will be loaded then the view will load after that model will load by the controller.
Advantage of CI:-
1 Light-weight Framework as compare to other MVC Framework of PHP. such as Laravel, Symphony, Zend, CakePHP, YI
2 Easy to install and Use for developer
3 Best in Security
4 Provide Rich Functionality
5 Provide Best API Support
6 Fully Open Source and Free Software
7 Contain Separate Directory for System based library in an application.
How to use CI?
STEP 1s:- Download CI and put it into C:/xampp/htdocs folder
Step2nd:- Open localhost/foldername it will open the Welcome controller and view
Folder Structure of CI:-
CI contains three different folders.
1 Application:-
it is used to contain Controller, Model, View, Config, and different folders to write code.
2 System:-
it is used to contain the predefined library of CI.
3 User_Guide:-
it will contain the complete tutorial of CI.
Create a Hello World Program in CI?
Step1st:-
Create Controller under Application/Controller
class Classname extends CI_Controller
{
function index()
{
$this->load->view('Viewname');
}
}
2 Create View using Application/View Folder
Create .php file and Write Html Code View name should be the same which is defined on the Controller index method
3 Open Application/config/routes.php
Set Default_Controller to this Controller
application/controller
<?php
class Hello extends CI_Controller
{
function index()
{
$this->load->view('helloview');
}
}
?>
helloview.php of application/views
<!DOCTYPE html>
<html>
<head>
<title></title>
</head>
<body>
<h1>Welcome in CI</h1>
</body>
</html>
Create a Hello World Program in CI?
Step1st:-
Create Controller under Application/Controller
class Classname extends CI_Controller
{
function index()
{
$this->load->view('Viewname');
}
}
2 Create View using Application/View Folder
Create .php file and Write Html Code View name should be the same which is defined on the Controller index method
3 Open Application/config/routes.php
Set Default_Controller to this Controller
application/controller
<?php
class Hello extends CI_Controller
{
function index()
{
$this->load->view('helloview');
}
}
?>
helloview.php of application/views
<!DOCTYPE html>
<html>
<head>
<title></title>
</head>
<body>
<h1>Welcome in CI</h1>
</body>
</html>
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