With the popularity of mobile Internet and music services, music players have become an indispensable part of our lives. For developers who want to develop a music player themselves, using the PHP framework Symfony will be an efficient choice.

Symfony is a PHP framework based on the MVC pattern. It provides many efficient tools and components to help developers quickly build high-quality Web applications. In this article, we will introduce how to use the Symfony framework to build an efficient music player.

1. Management of Music Media

A music player needs to correctly manage the metadata information of music files, such as album name, song name, artist name, etc. Symfony can use Doctrine ORM to manage data. ORM stands for "Object Relational Mapping", which can map data in the database into PHP objects, and PHP objects can be used to perform database operations.

In Symfony, use Composer to install the Doctrine component:

composer require symfony/orm-pack

In Doctrine, you can use annotations or XML files to define the attributes and relationships of entities (Entity). Here is an example of an entity:

<?php
namespace AppEntity;

use DoctrineORMMapping as ORM;

/**
 * @ORMEntity(repositoryClass="AppRepositorySongRepository")
 */
class Song
{
    /**
     * @ORMId()
     * @ORMGeneratedValue()
     * @ORMColumn(type="integer")
     */
    private $id;

    /**
     * @ORMColumn(type="string", length=255)
     */
    private $title;

    /**
     * @ORMColumn(type="string", length=255)
     */
    private $artist;

    /**
     * @ORMColumn(type="string", length=255)
     */
    private $album;

    // 其他屬性

    /**
     * @ORMColumn(type="datetime")
     */
    private $uploadedAt;

    // getter和setter方法
}

In this entity, we define the attributes of the song, such as title, artist, album, etc. We also define the upload time attribute, which helps us sort the songs.

In Symfony, you can use the command line tool to create and update database tables:

php bin/console doctrine:schema:create
php bin/console doctrine:schema:update --force

2. Display of music list

In the controller, we A list of songs can be obtained from the database and passed into a Twig template for display.

<?php
namespace AppController;

use AppEntitySong;
use SymfonyBundleFrameworkBundleControllerAbstractController;
use SymfonyComponentRoutingAnnotationRoute;

class MusicController extends AbstractController
{
    /**
     * @Route("/music", name="music")
     */
    public function index()
    {
        $songs = $this->getDoctrine()
            ->getRepository(Song::class)
            ->findAll();

        return $this->render('music/index.html.twig', [
            'songs' => $songs,
        ]);
    }
}

In the template, you can use Twig's loop statements and variables to display the music list. Here is a simple example:

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

{% block body %}
    <h1>My Music Player</h1>
    <ul>
        {% for song in songs %}
            <li>{{ song.title }} - {{ song.artist }} ({{ song.album }})</li>
        {% endfor %}
    </ul>
{% endblock %}

This will get the songs from the database and display them in a list.

3. Music stream playback

Using Symfony, we can set the response (Response) object in the controller and output the content of the music file as a response stream.

<?php
namespace AppController;

use SymfonyBundleFrameworkBundleControllerAbstractController;
use SymfonyComponentHttpFoundationRequest;
use SymfonyComponentHttpFoundationResponse;
use SymfonyComponentRoutingAnnotationRoute;

class MusicController extends AbstractController
{
    /**
     * @Route("/music/{id}/file", name="music_file")
     */
    public function file(Request $request, $id)
    {
        $song = $this->getDoctrine()
            ->getRepository(Song::class)
            ->find($id);

        $path = $this->getParameter('music_directory').'/'.$song->getPath();

        $response = new Response();
        $response->headers->set('Content-Type', 'audio/mpeg');
        $response->headers->set('Content-Disposition', 'inline; filename="'.basename($path).'"');
        $response->headers->set('Content-Length', filesize($path));

        $response->setContent(file_get_contents($path));

        return $response;
    }
}

In this controller, we get a song from the database and output the contents of its music file as a response stream. We also set the Content-Type and Content-Disposition headers of the response, as well as the Content-Length header.

Note that the music file path here is obtained from the Symfony parameter (Parameter). We can store it in the parameter file to use different paths in different environments.

In Twig, we can pass the URL of the music file into the audio tag to play the music in the browser.

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

{% block body %}
    <h1>My Music Player</h1>
    <ul>
        {% for song in songs %}
            <li>
                {{ song.title }} - {{ song.artist }} ({{ song.album }})
                <audio controls>
                    <source src="{{ path('music_file', { 'id': song.id }) }}" type="audio/mpeg">
                </audio>
            </li>
        {% endfor %}
    </ul>
{% endblock %}

Here, we use the path function to get the URL of the music file from the route and use it as the src attribute value of the source tag.

4. Other functions

In addition to basic music management and playback functions, we can also add other functions to the music player, such as search, playlist management, and lyrics display wait. Symfony provides many reusable components, such as search engines, forms, and Twig extensions, that can help us quickly develop these functions.

5. Summary

In this article, we introduced how to use the Symfony framework to quickly build an efficient music player, use Doctrine ORM for data management in Symfony, and use Twig Do template rendering and use Symfony's response objects to play music in the browser. Through these examples, developers can quickly understand how to use Symfony to build web applications and get some inspiration from them to use when developing music players.

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