How to clear APC cache entries

Question

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

User · Answer

We had a problem with APC and symlinks to symlinks to files -- it seems to ignore changes in files itself  Somehow performing touch on the file itself helped  I can not tell what s the difference between modifing a file and touching it  but somehow it was necessary

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A good solution for me was to simply not using the outdated user cache any more after deploy   If you add prefix to each of you keys you can change the prefix on changing the data structure of cache entries  This will help you to get the following behavior on deploy    Don t use outdated cache entries after deploy of only updated structures Don t clean the whole cache on deploy to not slow down your page Some old cached entries can be reused after reverting your deploy  If the entries wasn t automatically removed already  APC will remove old cache entries after expire OR on missing cache space   This is possible for user cache only

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If you are running on an NGINX   PHP-FPM stack  your best bet is to probably just reload php-fpm  service php-fpm reload  or whatever your reload command may be on your system

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if you run fpm under ubuntu  need to run the code below  checked on 12 and 14   service php5-fpm reload

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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

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The stable of APC is having option to clear a cache in its interface itself  To clear those entries you must login to apc interface   APC is having option to set username and password in apc php file

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Another possibility for command-line usage  not yet mentioned  is to use curl   This doesn t solve your problem for all cache entries if you re using the stock apc php script  but it could call an adapted script or another one you ve put in place   This clears the opcode cache   curl --user apc  PASSWORD  http   www example com apc php CC 1 amp OB 1 amp  date   s     Change the OB parameter to 3 to clear the user cache   curl --user apc  PASSWORD  http   www example com apc php CC 1 amp OB 3 amp  date   s     Put both lines in a script and call it with  PASSWORD in your env

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As defined in APC Document   To clear the cache run    php -r  function exists  apc clear cache     apc clear cache     null

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My work-around for Symfony build having loot of instances at the same server   Step 1  Create trigger or something to set a file flag  eg  Symfony command  then create marker file      file put contents  clearAPCU   yes sir i can buggy     Step 2  On index file at start add clearing code and remove marker file   if file exists  clearAPCU         apcu clear cache        unlink  clearAPCU        Step 2  Run app

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apc clear cache   only works on the same php SAPI that you want you cache cleared  If you have PHP-FPM and want to clear apc cache  you have do do it through one of php scripts  NOT the command line  because the two caches are separated   I have written CacheTool  a command line tool that solves exactly this problem and with one command you can clear your PHP-FPM APC cache from the commandline  it connects to php-fpm for you  and executes apc functions   It also works for opcache   See how it works here  http   gordalina github io cachetool

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Create APC php file   foreach array  user   opcode      as  v        apc clear cache  v       Run it from your browser

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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

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New APC Admin interface have options to add clear user cache and opcode cache  One interesting functionality is to add refresh delete directory s from opCode Cache  APC Admin Documentation

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apc ini   apc stat    1  will force APC to stat  check  the script on each request to determine if it has been modified  If it has been modified it will recompile and cache the new version    If this setting is off  APC will not check  which usually means that to force APC to recheck files  the web server will have to be restarted or the cache will have to be manually cleared  Note that FastCGI web server configurations may not clear the cache on restart  On a production server where the script files rarely change  a significant performance boost can be achieved by disabled stats

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If you want to monitor the results via json  you can use this kind of script    lt  php   result1   apc clear cache     result2   apc clear cache  user     result3   apc clear cache  opcode     infos   apc cache info     infos  apc clear cache      result1   infos  apc clear cache  user        result2   infos  apc clear cache  opcode        result3   infos  success      result1  amp  amp   result2  amp  amp   result3  header  Content-type  application json    echo json encode  infos     As mentioned in other answers  this script will have to be called via http or curl and you will have to be secured if it is exposed in the web root of your application   by ip  token

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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    apc clear php  This is the file that the script copies to the web directory  accesses  and deletes    lt  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    gt  true      else     die  SUPER TOP SECRET       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     amp  amp   result  success          handle success   else       handle failure    unlink  apcPaths  web

User · Answer

If you want to clear apc cache in command    use sudo if you need it   APCu  php -r  apcu clear cache        APC  php -r  apc clear cache    apc clear cache  user    apc clear cache  opcode

User · Answer

This is not stated in the documentation  but to clear the opcode cache you must do   apc clear cache  opcode      EDIT  This seems to only apply to some older versions of APC    No matter what version you are using you can t clear mod php or fastcgi APC cache from a php cli script since the cli script will run from a different process as mod php or fastcgi  You must call apc clear cache   from within the process  or child process  which you want to clear the cache for  Using curl to run a simple php script is one such approach

[php] How to clear APC cache entries?

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