How to configure and use Redis cache in CodeIgniter4?

Configuration and application of Redis cache under CodeIgniter4 framework

This article will explain in detail how to configure and use Redis as a cache in the CodeIgniter4 framework and solve some common problems.

question:

After modifying the Redis configuration in app/config/cache.php file, many developers found that the application did not actually use the Redis cache. This is usually caused by the lack of necessary PHP Redis extensions or configuration errors.

Solution:

Properly configuring the Redis cache for CodeIgniter4 requires the following steps:

1. Install the PHP Redis extension: Make sure your server has the PHP Redis extension installed. In Ubuntu system, you can use the following command to install:

    sudo apt-get install php-redis

   After the installation is complete, restart the web server to make the extension take effect.

2. Configure cache.php file: Open app/config/cache.php file, find the $redis array, and modify the following parameters according to your Redis server configuration:

    public $redis = [
       'host' => '127.0.0.1',
       'password' => null,
       'port' => 6379,
       'timeout' => 0,
       'database' => 0,
   ];

3. Set the cache processor: In the cache.php file, set handler property to redis :

    public $handler = 'redis';

4. Test Redis Cache: Use the following code to test whether Redis is effective:

    $cache = \Config\Services::cache();
   $cache->save('test_key', 'test_value', 300); // Save the cache, valid for 5 minutes echo $cache->get('test_key'); // Output 'test_value' means Redis has taken effect

If it still fails to take effect, please check the following points:

• Is the Redis server running normally and configured correctly.
• Is the PHP Redis extension installed and enabled correctly?
• Is the cache.php file saved correctly and read by CodeIgniter4.

Through the above steps, you should be able to successfully configure and use Redis cache in CodeIgniter4. If you have any questions, please carefully check the performance of each step.

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