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How to use Symfony8 framework in php?

王林Original: 2023-06-04 08:31:321368browse

As the needs of modern applications become more and more complex, using frameworks to develop applications has become an inevitable trend. Symfony is a widely recognized PHP framework designed for building high-quality web applications. Symfony 8 is the latest version of the Symfony framework, which offers many new features and enhancements. In this article, we will take a deep dive into how to use the Symfony 8 framework.

1. Install Symfony 8

Before you start using Symfony 8, you need to install PHP, Composer and Symfony 8 on your local computer. After installing Composer on your local machine, you can open the command line interface and run the following command to install Symfony 8:

composer create-project symfony/website-skeleton my_project_name

This command will download Symfony 8 from the Composer repository and install it in your project file Clamped. Once the installation is complete, you can start Symfony 8’s built-in web server by running the following command in your project folder:

cd my_project_name
symfony server:start

Now you can view Symfony 8’s by typing http://localhost:8000 in your browser Welcome page.

2. Create a controller

In Symfony 8, you can use controllers to handle routing and requests. A controller is a simple PHP class that receives requests from the user and sends them to the appropriate function. Next, we'll create a presentation controller.

First, create a new file called DemoController.php in the src/Controller folder. Then, enter the following code in the file:

namespace AppController;

use SymfonyComponentHttpFoundationResponse;
use SymfonyComponentRoutingAnnotationRoute;

class DemoController
{
    /**
     * @Route("/demo")
     */
    public function index()
    {
        return new Response('Hello, World!');
    }
}

In this controller, we use Symfony 8's annotation routing mechanism to point the route to the /demo path and return the 'text/plain' response Returns 'Hello, World!'.

Next, open the routes.yaml file in the configuration folder and add the following content:

# config/routes.yaml
demo:
    path: /demo
    controller: AppControllerDemoController::index

In this configuration, we map the route to /demo path, and use the index method of DemoController as the route processor.

Finally, start Symfony 8’s built-in web server and enter http://localhost:8000/demo in your browser. You should see a "Hello, World!" message in your browser.

3. Use Twig template engine

Twig is the default template engine in the Symfony 8 framework. It is an advanced template engine that provides many useful features and tools such as template inheritance and layout. Next, we will learn how to use the Twig template engine in a Symfony 8 application.

First, create a new file named twig.yaml in config/packages and add the following configuration:

# config/packages/twig.yaml
twig:
    default_path: '%kernel.project_dir%/templates'

In this configuration, we specify The default path to the template directory.

Next, create a new file called base.html.twig in the templates folder and add the following code:

<!DOCTYPE html>
<html>
    <head>
        <meta charset="UTF-8" />
        {% block title %}
            <title>{% endblock %}</title>
        {% endblock %}
    </head>
    <body>
        {% block body %}
        {% endblock %}
    </body>
</html>

In this code, We use Twig’s block functionality to define the title and content of the template.

Now, create a new file called demo.html.twig in the templates folder and add the following code:

{% extends 'base.html.twig' %}

{% block title %}Demo Page{% endblock %}

{% block body %}
    <h1>Hello, World!</h1>
{% endblock %}

In this code, we The base.html.twig template is extended and the title and page content are defined.

Finally, update the DemoController class to use the Twig template engine to render the demo.html.twig template. Add the following code:

namespace AppController;

use SymfonyBundleFrameworkBundleControllerAbstractController;
use SymfonyComponentHttpFoundationResponse;
use SymfonyComponentRoutingAnnotationRoute;

class DemoController extends AbstractController
{
    /**
     * @Route("/demo")
     */
    public function index()
    {
        return $this->render('demo.html.twig', [
            'message' => 'Hello, World!',
        ]);
    }
}

In this code, we use the render method to render the demo.html.twig template and use the message parameter to pass the message into the template.

Start Symfony 8’s built-in web server again and enter http://localhost:8000/demo in the browser. You should see a more beautiful and interactive "Hello, World!" page in your browser.

To sum up, Symfony is a powerful PHP framework with extensive community support and extensive documentation. In Symfony 8, many new features and enhancements help you develop high-quality web applications with ease. Using the Twig template engine can help you create more beautiful and interactive pages. Now you know how to use the Symfony 8 framework!

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