How to clear APC cache entries?

04/03/2020 08:30:01

I need to clear all APC cache entries when I deploy a new version of the site. APC.php has a button for clearing all opcode caches, but I don't see buttons for clearing all User Entries, or all System Entries, or all Per-Directory Entries.

Is it possible to clear all cache entries via the command-line, or some other way?

Verified Answer (145 Votes)

05/26/2009 21:14:02

You can use the PHP function apc_clear_cache.

Calling apc_clear_cache() will clear the system cache and calling apc_clear_cache('user') will clear the user cache.

145

Answer #2 (116 Votes)

08/27/2010 07:30:26

I don't believe any of these answers actually work for clearing the APC cache from the command line. As Frank Farmer commented above, the CLI runs in a process separate from Apache.

My solution for clearing from the command line was to write a script that copies an APC clearing script to the web directory and accesses it and then deletes it. The script is restricted to being accessed from the localhost.

  1. apc_clear.php

    This is the file that the script copies to the web directory, accesses, and deletes.

    <?php
    if (in_array(@$_SERVER['REMOTE_ADDR'], array('127.0.0.1', '::1')))
    {
      apc_clear_cache();
      apc_clear_cache('user');
      apc_clear_cache('opcode');
      echo json_encode(array('success' => true));
    }
    else
    {
      die('SUPER TOP SECRET');
    }
    
  2. Cache clearing script

    This script copies apc_clear.php to the web directory, accesses it, then deletes it. This is based off of a Symfony task. In the Symfony version, calls are made to the Symfony form of copy and unlink, which handle errors. You may want to add checks that they succeed.

    copy($apcPaths['data'], $apcPaths['web']); //'data' is a non web accessable directory
    
    $url = 'http://localhost/apc_clear.php'; //use domain name as necessary
    $result = json_decode(file_get_contents($url));
    
    if (isset($result['success']) && $result['success'])
    {
      //handle success
    }
    else
    {
      //handle failure
    }
    
    unlink($apcPaths['web']);
    
116

Answer #3 (67 Votes)

07/13/2011 21:15:03

I know it's not for everyone but: why not to do a graceful Apache restart?

For e.g. in case of Centos/RedHat Linux:

sudo service httpd graceful

Ubuntu:

sudo service apache2 graceful
67
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