PHP Implementation Framework: Symfony Getting Started Tutorial

Symfony is a web development framework based on PHP language. It provides a series of tools and components to help developers quickly develop high-quality web applications. The Symfony framework is widely used in web applications, allowing developers to build applications that are highly scalable and flexible.

In this article, we will introduce you to the Symfony framework and provide some simple guidance on how to use the Symfony framework to build web applications.

Installing Symfony

Before using Symfony, you need to install the Symfony framework into your project. You can install it in two ways:

1. Install using Symfony Installer

First, you need to install composer on your computer, which is a PHP library manager , can help you install Symfony.

After installing composer, use the following command to install the Symfony installer:

>> curl -LsS https://symfony.com/installer -o /usr/local/bin/symfony
>> chmod a+x /usr/local/bin/symfony

After the installation is complete, you can use the following command to create a new Symfony project:

>> symfony new project_name

2. Manual installation

Manual installation of the Symfony framework requires you to download and unzip the Symfony archive file and copy it directly to your project.

Create a Symfony application

In the Symfony framework, an application is composed of one or more bundles. A bundle is a collection of specific functions that can include routes, controllers, views, entities, etc.

To create a new Symfony application, you need to create a new bundle. Run the following command to create a new bundle:

>> php bin/console generate:bundle

After running the command, you will see some prompts such as:

Bundle namespace: AppBundle
Target directory [src/]:

Following the prompts, you need to enter the name of the bundle (by default Below is "AppBundle") and select the directory location of the bundle. Follow the step-by-step instructions to create a new bundle.

Define routing

Setting up routing in Symfony is very simple. You just need to create a file called "routing.yml", which is located under the "app/config/" directory, and then define the routes in the file:

app_homepage:
  path: /
  controller: AppBundle:Default:index

In the above example, we defined A route named "app_homepage" that will perform the indexing action of the default controller when the user accesses the root directory of the application.

Controllers

Symfony controllers are classes that implement specific operations. They receive HTTP requests and return HTTP responses. By default, all Symfony controllers should return a Symfony response object.

To create a new Symfony controller, you need to create a new PHP class and then extend it to "SymfonyBundleFrameworkBundleControllerController". In this class you can define various controller actions. Here is an example of a simple Symfony controller class:

<?php

namespace AppBundleController;

use SymfonyBundleFrameworkBundleControllerController;
use SymfonyComponentHttpFoundationRequest;
use SymfonyComponentHttpFoundationResponse;

class DefaultController extends Controller
{
    public function indexAction(Request $request)
    {
        return new Response('Symfony入门教程');
    }
}

The above code defines a controller action called "indexAction" which returns a Symfony response object with the text "Symfony Getting Started Tutorial".

Views

Symfony views are template files that allow you to organize and render pages in a reusable way. Unlike other frameworks, Symfony views use the Twig template engine. Twig is an open source PHP template engine that is intuitive, secure and performant.

To create a Symfony view, you simply create a file called "index.html.twig" in the views directory and add the following:

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

{% block body %}
    <h1 id="Welcome-to-Symfony">Welcome to Symfony</h1>

    <p>{{ message }}</p>
{% endblock %}

In this template , we set a variable called "message" and display it. The value of the variable will be passed into the view from the controller action.

Finally, we need to load the template in the controller action.

public function indexAction(Request $request)
{
    $message = 'Symfony入门教程';

    return $this->render('AppBundle:Default:index.html.twig', array(
        'message' => $message,
    ));
}

In this we use the "$this->render()" method to pass the template file and variables of the controller action to the Symfony kernel in order to render all the data to the end user.

Getting started with Symfony

Now you know the basics of the Symfony framework. You can easily build complex web applications using the Symfony framework. You can learn more about Symfony knowledge and practices, please refer to the Symfony official documentation.

Thank you for reading this article, I hope you can gain more and more useful knowledge and experience from Symfony.

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