How to use Symfony9 framework in php?

With the development of Web technology, more and more developers are beginning to choose to use PHP as their Web development language. Moreover, the emergence of frameworks has made PHP development more standardized and efficient.

Symfony is an open source framework in PHP that is highly scalable, flexible and secure. This article will introduce how to use the Symfony9 framework.

1. Environment setup

Using Symfony development needs to meet the following environmental requirements:

• PHP version 7.4 or above.
• Composer package manager.
• Symfony CLI.

To install on Windows systems, you can use the following command

$ symfony new my_project_name --full

On Mac OS X or Linux, you can use brew to install Symfony CLI.

$ brew tap symfony/symfony
$ brew install symfony

2. Create a Symfony project

In the command line, use the following command to create a new Symfony project:

$ symfony new my_project_name --full

This will create a new Symfony project, Contains all default recommended features.

3. Run the Symfony project

Before running the Symfony project, you need to enter the project directory and start the built-in Web server:

$ cd my_project_name/
$ symfony server:start

Now, you can enter http: //localhost:8000 accesses Symfony9 applications.

4. Create a controller

In Symfony, the controller is used to process HTTP requests and generate HTTP responses. Let's create a simple controller below.

Create a new controller named "HelloController" using the following command:

$ symfony console make:controller HelloController

The above command will generate the following code:

// src/Controller/HelloController.php
namespace AppController;

use SymfonyBundleFrameworkBundleControllerAbstractController;
use SymfonyComponentHttpFoundationResponse;
use SymfonyComponentRoutingAnnotationRoute;

class HelloController extends AbstractController
{
    /**
     * @Route("/hello", name="hello")
     */
    public function index(): Response
    {
        return $this->render('hello/index.html.twig', [
            'controller_name' => 'HelloController',
        ]);
    }
}

Now, it can be accessed in the browser http://localhost:8000/hello, you will see content related to "Hello World".

5. Create an entity

In Symfony, entities are used to represent tables in the database and are managed through Doctrine ORM. Next, we will create an entity for our application.

Use the following command to create a new entity "Task":

$ php bin/console make:entity Task

The above command will prompt you to enter the properties of the Task entity, such as name, description, deadline, etc.

After generating the entity, you need to run the migration that uses Doctrine to create the database schema:

$ php bin/console make:migration
$ php bin/console doctrine:migrations:migrate

Now, the database schema has been created. Next we will create a Task form that allows users to create new tasks.

6. Create a form

In Symfony, forms are used to process user input. We need to create a form called "TaskType" using

Create a new form type using the following command:

$ php bin/console make:form TaskType

This will create a new form type in the path src/Form/TaskType.php.

Then, we need to create a controller and a Twig template to render the form into the browser.

Create a new controller named "TaskController" using the following command:

$ php bin/console make:controller TaskController

This will create a new controller in the path src/Controller/TaskController.php.

7. Conclusion

This article introduces how to use the Symfony9 framework to create web applications. This includes knowledge points on environment construction, project creation, controllers, entities, forms, etc. It is hoped that readers can use the Symfony9 framework to develop Web applications more efficiently and achieve better development results based on these foundations.

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