LXIX. Memcache Functions

Úvod

Memcache module provides handy procedural and object oriented interface to memcached, highly effective caching daemon, which was especially designed to decrease database load in dynamic web applications.

This module doesn't have native support of multiple servers, but you still can implement it yourself in your application. Establish several memcached connections, set priority level for each server etc.

More information about memcached can be found at http://www.danga.com/memcached/.

Požiadavky

This module uses functions of zlib to support on-the-fly data compression. Zlib is required to install this module.

PHP 4.3.3 or newer is required to use the memcache extension.

Inštalácia

Toto PECL roz��renie nie je pribalen� s PHP. Dodato�n� inform�cie ako s� nov� vydania, downloady, zdrojov� s�bory, inform�cie od spracov�vate�a, a CHANGELOG, je mo�n� n�js� tu: http://pecl.php.net/package/memcache.

In order to use these functions you must compile PHP with MemCache support by using the --with-memcache[=DIR] option.

Windows users will enable php_memcache.dll inside of php.ini in order to use these functions. Toto PECL roz��renie DLL si m�ete stiahn� zo str�nky PHP Download alebo na http://snaps.php.net/.

Preddefinované Konštanty

Tabuľka 1. MemCache Constants

NameDescription
MEMCACHE_COMPRESSED (integer) Used to turn on-the-fly data compression on with Memcache::set(), Memcache::add() a Memcache::replace().

Runtime Konfigurácia

Toto roz��renie nem� �iadne konfigura�n� direkt�vy definovan� v php.ini.

Typy zdrojov

There is only one resource type used in memcache module - it's the link identifier for a cache server connection.

Príklady

Príklad 1. memcache extension overview example

<?php

$memcache
= new Memcache;
$memcache->connect('localhost', 11211) or die ("Could not connect");

$version = $memcache->getVersion();
echo
"Server's version: ".$version."<br/>\n";

$tmp_object = new stdClass;
$tmp_object->str_attr = 'test';
$tmp_object->int_attr = 123;

$memcache->set('key', $tmp_object, false, 10) or die ("Failed to save data at the server");
echo
"Store data in the cache (data will expire in 10 seconds)<br/>\n";

$get_result = $memcache->get('key');
echo
"Data from the cache:<br/>\n";

var_dump($get_result);

?>

In the above example, an object is being saved in the cache and then retrieved back. Object and other non-scalar types are serialized before saving, so it's impossible to store resources (i.e. connection identifiers and others) in the cache.

Obsah
Memcache::add -- Add an item to the server
Memcache::close -- Close memcached server connection
Memcache::connect -- Open memcached server connection
memcache_debug -- Turn debug output on/off
Memcache::decrement -- Decrement item's value
Memcache::delete -- Delete item from the server
Memcache::flush -- Flush all existing items at the server
Memcache::get -- Retrieve item from the server
Memcache::getStats -- Get statistics of the server
Memcache::getVersion -- Return version of the server
Memcache::increment -- Increment item's value
Memcache::pconnect -- Open memcached server persistent connection
Memcache::replace -- Replace value of the existing item
Memcache::set -- Store data at the server