Hello from Symfony

Create a Symfony project

Let's start by creating a fresh new Symfony application using Symfony CLI. Open a terminal and run:

symfony new poc-symfony

The project name poc-symfony here is not important, you can choose whatever you want as project name.

I’m using here Symfony CLI to create a new Symfony application.

If you don’t want to use it, you can use the famous Composer tool as an alternative to create the application:

composer create-project symfony/skeleton poc-symfony 

Read this doc to know more about using Composer to create Symfony application.

Start the integrated Symfony server:

symfony serve -d

The -d option is used to run the server as a daemon, in the background. To stop it, you can run:

symfony server:stop

If you didn't installed the Symfony CLI, you can use the built-in PHP web server by running:

php -S localhost:8000 -t public/

By default, the port used is the 8000. Open now your application in your favorite browser at the given URL (https://localhost:8000 by default).

You now have something like this in your browser:

Our goal here : create our first Symfony Controller and render our first template with Twig to show Hello from Symfony!?

First, install the twig package by running:

composer require twig

Thanks to Symfony Flex, we have also a few files who were added to our project.

Create now our first PHP file which will be our first Symfony Controller. I'm gonna create a new file called HomeController.php (in src/Controller directory, you can name it whatever you want) with this content:

<?php

declare(strict_types=1);

namespace App\Controller;

use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
use Symfony\Component\HttpFoundation\Response;
use Symfony\Component\Routing\Attribute\Route;

final class HomeController extends AbstractController
{
    #[Route('/', name: 'home')]
    public function home(): Response
    {
        return $this->render('home/index.html.twig');
    }
}

Nothing special here, the HomeController is extending the Symfony AbstractController, and use the render method from it to return a Response from the HTTPFoundation Component.

We have a route matching the / pattern, with name home. The associated method is also named home, and return a twig template.

The twig template content contains this:

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

{% block body %}
    <h1>Hello from Symfony!?</h1>
{% endblock %}

We just extends the base.html.twig file and customize the content in the body block.
Refresh your page and voilà ?

Congratulations, you made it ?

Testing our application

Testing time ?️
It’s time to test our application.

You don't test your application ? You are too good to add tests ?

Your choice, but I prefer to add some to make sure everything works as expected.

Let's add a new pack for testing by running:

composer require --dev symfony/test-pack

Again, thanks to Symfony Flex, we have a few more files installed with a default configuration working.

Create now a PHP file for test. I called this file HomeControllerTest (in tests/Controller directory):

symfony new poc-symfony

This simple test can help us check everything works in our application.

Run the tests:

composer create-project symfony/skeleton poc-symfony 

Congrats, the test pass, you rock ?

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