How to Get Set and Delete from Redis in Symfony

To get, set and delete data from Redis in Symfony, you can use the predis/predis package, which provides a PHP client library for Redis. Here's a step-by-step guide on how to use Redis in Symfony:

1. Install the predis/predis package:
Open a terminal in your Symfony project directory and run the following command to install the predis/predis package via Composer:

composer require predis/predis

2. Configure Redis connection parameters:
In your Symfony project, open the config/packages/redis.yaml file (create it if it doesn't exist) and add the Redis connection parameters:

parameters:
redis_host: 127.0.0.1
redis_port: 6379

You can adjust the redis_host and redis_port values to match your Redis server configuration.

3. Create a Redis service:
Next, you can create a Redis service to interact with the Redis server. Open the src/Service/RedisService.php file (create the directory and file if they don't exist) and add the following code:

<?php

namespace App\Service;

use Predis\Client;

class RedisService
{
    private $client;

    public function __construct(string $redisHost, int $redisPort)
    {
        $this->client = new Client([
            'scheme' => 'tcp',
            'host' => $redisHost,
            'port' => $redisPort,
        ]);
    }

    public function set(string $key, $value): void
    {
        $this->client->set($key, $value);
    }

    public function get(string $key)
    {
        return $this->client->get($key);
    }

    public function delete(string $key): void
    {
        $this->client->del($key);
    }

}

4. Inject the Redis service into your controller:
Now, you can use the RedisService in your controller to set and get data from Redis. Open your desired controller, for example, src/Controller/DefaultController.php, and inject the RedisService:

<?php

namespace App\Controller;

use App\Service\RedisService;
use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
use Symfony\Component\HttpFoundation\Response;
use Symfony\Component\Routing\Annotation\Route;

class DefaultController extends AbstractController
{
    /**
     * @Route("/set-redis-data", name="set_redis_data")
     */
    public function setRedisData(RedisService $redisService): Response
    {
        // Set data in Redis
        $redisService->set('my_key', 'Hello, Redis in Symfony!');

        return new Response('Data set in Redis.');
    }

    /**
     * @Route("/get-redis-data", name="get_redis_data")
     */
    public function getRedisData(RedisService $redisService): Response
    {
        // Get data from Redis
        $data = $redisService->get('my_key');

        return new Response('Data from Redis: ' . $data);
    }

    /**
     * @Route("/delete-redis-data", name="delete_redis_data")
     */
    public function deleteRedisData(RedisService $redisService): Response
    {
        // Delete data from Redis
        $redisService->delete('my_key');

        return new Response('Data deleted from Redis.');
    }

}

5. Test the endpoints:
After implementing the controller methods, you can now test the endpoints. Open your browser or use a tool like curl to access the following URLs:

• - http://localhost/set-redis-data: This will set the data "Hello, Redis in Symfony!" in Redis.
• - http://localhost/get-redis-data: This will retrieve the data from Redis and display it on the page.
• -http://localhost/delete-redis-data: This will delete the data associated with the key my_key from Redis.

That's it! You have now successfully set up and used Redis in Symfony using the predis/predis package.