PHP. Руководство по PHP. 2005

Memcache FunctionsПред.

LXXII. Memcache Functions

Введение

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://danga.com/memcached/.

Требования

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

PHP4.3.3 or newer is required to use the memcache extension.

Установка

Это расширение PECL

не поставляется вместе с PHP. Дополнительная информация, такая как новый версии,

скачивание, исходные файлы, информация о разработчике и CHANGELOG, могут

быть найдены здесь: 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. Вы можете скачать DLL этого

расширения PECL со страницы -PHP Downloads или -http://snaps.php.net/.

Предопределенные константы

Таблица 1. MemCache Constants

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

Настройка во время выполнения

Данное расширение не определяет никакие директивы конфигурации в php.ini.

Типы ресурсов

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

Примеры

Пример 1. memcache extension overview example


<?
$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.

Содержание

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