Why is it not enough to just modify the configuration file when configuring and using Redis cache in CodeIgniter4?

Detailed explanation of CodeIgniter4 Redis cache configuration and usage

This article will explain in detail how to properly configure and use Redis cache in the CodeIgniter4 framework. Many developers encounter problems during the configuration process, and only modifying app/config/cache.php file cannot take effect. This article will solve such problems and provide a complete solution.

Problem: The reason why Redis cache fails after modifying cache.php

Only modifying the Redis configuration in app/config/cache.php file does not guarantee that it will take effect. You need to make sure that the following key steps are completed:

Solution:

1. Installing the PHP Redis extension: This is a prerequisite for using Redis cache. Please check if your PHP environment has Redis extension installed. Verify using the following command:

   php -m | grep redis

   If there is no output, you need to install the Redis extension. The installation method depends on your operating system, for example on Ubuntu:

   sudo apt-get install php-redis

   After the installation is complete, remember to restart your web server.

2. Correctly configure cache.php file: Open app/config/cache.php file to ensure that the Redis configuration is correct. The configuration example is as follows:

   public $redis = [
      'host' => '127.0.0.1',
      'password' => null, // If Redis has set a password, please fill in 'port' => 6379,
      'timeout' => 0,
      'database' => 0, // Select Redis database];

   Please modify the above configuration based on your Redis server information.

3. Set the default cache driver: In the cache.php file, set the $preferreddriver variable to redis :

   public $preferreddriver = 'redis';

   This will make CodeIgniter4 preferred to use Redis for cache operations.

4. Using Cache Services: In your controller or model, use Services::cache() to access the cache service:

   $cache = \Config\Services::cache();
   $cache->save('my_key', 'my_value', 300); // Cache 'my_value' 300 seconds $value = $cache->get('my_key');

troubleshooting:

If Redis cache is still not available, please check the following:

• Whether the Redis server is running: Make sure your Redis server is running and accessible.
• Firewall: Make sure the firewall does not prevent your application from connecting to the Redis server.
• Configuration error: Double check the configuration in the cache.php file to make sure all parameters are correct.
• Permissions: Check whether your PHP process has permission to access the Redis server.

Through the above steps, you should be able to successfully configure and use Redis cache in CodeIgniter4. If you have any questions, please double-check each step and make sure your Redis server is running properly.

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