How to Clear APC Cache Entries: A Step-by-Step Guide

Clearing APC Cache Entries: A Comprehensive Guide

When deploying a new version of your website, it is essential to clear the APC (Alternative PHP Cache) cache entries to ensure that the updated code is executed. While APC.php provides an option to clear opcode caches, it lacks similar functionalities for User Entries, System Entries, and Per-Directory Entries.

Clearing Cache Entries via Command-Line

To overcome this limitation, you can leverage the PHP function apc_clear_cache() to effectively clear the system cache. This involves executing the following command:

apc_clear_cache();

Alternatively, to clear the user cache, you can use:

apc_clear_cache('user');

Other Clearing Options

In addition to the command-line approach, you can consider the following methods for clearing APC cache entries:

• Using APC API: The APC API allows you to programmatically clear both the system and user cache using methods such as apcu_clear_cache() and apcu_clear_cache('user').
• Modifying php.ini Configuration: By setting apc.cache_by_default to 0 in php.ini, you can prevent the cache from being used, effectively clearing all cache entries.
• Restarting Web Server: Restarting the web server, such as Apache or Nginx, will flush the APC cache entries.

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