How to Clear All APC Cache Entries: System, User, and Per-Directory?

Clearing APC Cache Entries

When deploying a new version of a site, it may be necessary to clear all APC cache entries. While APC.php provides a button for clearing opcode caches, there are no apparent options for erasing all User Entries, System Entries, or Per-Directory Entries.

Command-Line Solution

One method for clearing all cache entries is to leverage the PHP function apc_clear_cache. Invoking apc_clear_cache() will purge the system cache, and calling apc_clear_cache('user') will clear the user cache.

Example:

<code class="php"><?php
// Clear system cache
apc_clear_cache();

// Clear user cache
apc_clear_cache('user');
?></code>

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