CodeIgniter is a lightweight PHP framework that adopts MVC architecture to support rapid development and simplify common tasks. CodeIgniter 5 is the latest version of the framework and offers many new features and improvements. This article will introduce how to use the CodeIgniter 5 framework to build a simple web application.
Step 1: Install CodeIgniter 5
Downloading and installing CodeIgniter 5 is very simple, just follow these steps:
- Download the latest version of CodeIgniter 5 from the official GitHub repository.
- Extract the downloaded archive and place the CodeIgniter directory in the root directory of the web server.
- Run the composer install command to download and install all dependencies.
Now that we have CodeIgniter 5 installed, let’s start creating a new application.
Step 2: Create a new application
Start the web browser and enter the following address: http://localhost/CodeIgniter-5/public/, the CodeIgniter welcome page will be displayed on the screen. This indicates that we have successfully installed the CodeIgniter framework.
Next, we need to create a new application. To do this, follow the steps below:
- Go to the CodeIgniter directory and then the applications directory.
- In the applications directory, create a new directory and give it an appropriate name. For example, my application name is "MyApp".
- In the newly created directory, create three subdirectories: controllers, views, and models.
- Create a new controller file in the controllers directory and name it Main.php. This is the default controller we will use.
Now that we have created our new application, we will write the code to define the controllers and views.
Step 3: Write the Controller Code
Open the Main.php file we created in the previous step and add the following PHP code:
<?php
namespace MyAppControllers;
use CodeIgniterController;
class Main extends Controller
{
public function index()
{
$data = array('title' => '欢迎来到CodeIgniter 5!');
return view('welcome_message', $data);
}
}This code will define a A controller named Main and inheriting it from CodeIgniter's base controller. The controller contains a method called index, which will render a view file called welcome_message and pass an array parameter called "$data".
Step 4: Write the view file
In our view directory, create a new PHP file named welcome_message.php. Then add the following code:
<!DOCTYPE html>
<html>
<head>
<title><?= $title ?></title>
</head>
<body>
<h1><?= $title ?></h1>
<p>恭喜，你现在已经成功使用了CodeIgniter 5框架！</p>
</body>
</html>This code will define a simple HTML page with a title and some text content. The title of the page will be obtained from the array parameter named "$data".
Step 5: Test the Application
Once we have defined the controller and view files, we can use CodeIgniter 5’s routing system to test our application. To test your application, follow these steps:
- Open the URL of the default controller we created in step 2. In our example, the URL would look like this: http://localhost/CodeIgniter-5/public/MyApp.
- If everything is fine, your web browser will load the view file we created in step 4, and it will display a title and some text content.
Congratulations, you have successfully created a simple web application using the CodeIgniter 5 framework.
Conclusion
This article introduces how to use the CodeIgniter 5 framework to create a simple web application. We learned how to install the CodeIgniter 5 framework, create a new application, and define controller and view files. The CodeIgniter framework is a very powerful and useful tool that can help us develop web applications quickly while also providing many different features and tools. If you want to learn more about the CodeIgniter framework, please visit the official documentation and community forums.
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