International PHP Conference Spring 2015
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    • Introduction
    • Installing/Configuring
      • Requirements
      • Installation
      • Runtime Configuration
      • Resource Types
    • Predefined Constants
    • APC Functions
      • apc_add — Cache a new variable in the data store
      • apc_bin_dump — Get a binary dump of the given files and user variables
      • apc_bin_dumpfile — Output a binary dump of cached files and user variables to a file
      • apc_bin_load — Load a binary dump into the APC file/user cache
      • apc_bin_loadfile — Load a binary dump from a file into the APC file/user cache
      • apc_cache_info — Retrieves cached information from APC's data store
      • apc_cas — Updates an old value with a new value
      • apc_clear_cache — Clears the APC cache
      • apc_compile_file — Stores a file in the bytecode cache, bypassing all filters.
      • apc_dec — Decrease a stored number
      • apc_define_constants — Defines a set of constants for retrieval and mass-definition
      • apc_delete_file — Deletes files from the opcode cache
      • apc_delete — Removes a stored variable from the cache
      • apc_exists — Checks if APC key exists
      • apc_fetch — Fetch a stored variable from the cache
      • apc_inc — Increase a stored number
      • apc_load_constants — Loads a set of constants from the cache
      • apc_sma_info — Retrieves APC's Shared Memory Allocation information
      • apc_store — Cache a variable in the data store
    • APCIterator — The APCIterator class
      • APCIterator::__construct — Constructs an APCIterator iterator object
      • APCIterator::current — Get current item
      • APCIterator::getTotalCount — Get total count
      • APCIterator::getTotalHits — Get total cache hits
      • APCIterator::getTotalSize — Get total cache size
      • APCIterator::key — Get iterator key
      • APCIterator::next — Move pointer to next item
      • APCIterator::rewind — Rewinds iterator
      • APCIterator::valid — Checks if current position is valid
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    User Contributed Notes 3 notes

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    3
    umut dot kirgoz at gmail dot com
    3 years ago
    Since APC 3.1.3, there is a bug (pecl.php.net/bugs/bug.php?id=16814) which produces warnings like "Potential Cache Slam Averted for Key" when slam defense is on and you're trying to write a key that already exists.

    These is not a fix right now for this, but you can change the APC settings from php.ini file like below if possible:

    apc.write_lock = 1
    apc.slam_defense = 0
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    mike at eastghost dot com
    2 years ago
    Was using Memcache and Memcached extensions, painfully bouncing between faults, failures and shortcomings of each.  My two cents: Neither of these old drivers has been a smash hit, repressing and slowly dooming of the true potential and full use of unix memcached.

    The pain finally drove to me to try APC's apc_store and apc_fetch.  The results?  Instant success, no more errors, an order of magnitude (at least) speed boost, plus one less thing (memcached) to run.  Nice.  Never going back again.  Thank y'all.
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    hello at haroonahmad dot co dot uk
    5 years ago
    Disclaimer: i do not guarantee it will work for you so you better use it at your own risk. It works for me.

    * I am using # symbol for all shell commands

    I am posting a quick step-by-step guide to install APC on servers (dedicated or VPS) with cpanel/whm working.

    First login as a root to your server/vps and make a directory to work with this plugin,

    #mkdir /home/APC-php

    #cd /home/APC-php

    now here we will first download the APC with following command

    #wget pecl.php.net/get/APC-3.0.14.tgz

    you can check for the latest version

    now you can use gzip and tar separately or tar -xzvf to unzip this file

    #tar -xzvf APC-3.0.14.tgz

    now you will have a APC-3.0.14 folder.

    #cd APC-3.0.14

    now you have to make php configuration files by following command

    #phpize

    after this use following three commands

    # ./configure --enable-apc --enable-apc-mmap --with-apxs --with-php-config=/usr/bin/php-config

    *if you do not know the php path then execute ( which php ) command it will display the path. on a typical cpanel vps it could be /usr/bin/php-config or /usr/local/bin/php-config but you better check it before executing the above command)

    #make

    #make test

    #make install

    NOTE: if you are using suPHP then skip --with-apxs

    *one more thing, if you use

    #make test

    command it shows 3 tests failed then do not worry, it showed at least to me but worked with the final steps.

    the (make install) command will return the apc.so module path, note down that with you as you will have to feed it in the php.ini file in the next step.

    check your php.ini location by

    #php -i | grep php.ini

    then open it with your favorite editor. mine was at

    #vi /usr/local/lib/php.ini

    and go to the last line and paste the following

    extension="apc.so"

    now there is a catch in it, if you have other modules installed and their extension directory is different than the one MAKE INSTALL showed for APC so you have to move your apc.so to that directory so that all modules are in the same directory. in my case my APC directory was

    /usr/lib/php/extensions/no-debug-non-zts-20060613/

    but i moved apc.so from this location to my other location where my other extensions.so files were.

    you can check that path in php.ini sectiion of

    extension_dir = ""

    after this restart your apache, for different servers it may vary mine worked with

    #service httpd restart

    if everything works fine it will restart apache without showing any error. in case of any error, roll back your php.ini changes and restart apache and discuss your problem in some forum or email me at hello@haroonahmad.co.uk

    now check the phpinfo() output in your browser and it will display APC version information etc. for command line you might do

    php -i | grep apc

    I hope it helps.

    Haroon Ahmad
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