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# LXXII. Memcache Functions

# Introduktion

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/.

# Systemkrav

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.

# Installation

Denne PECL udvidelse medfølger ikke i PHP. Uddybende information så som nye udgivelser, downloads, kildekoder, vedligeholder information samt en CHANGELOG, kan findes her: 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. Du kan hente denne PECL udvidelse DLL fra PHP Downloads siden eller på http://snaps.php.net/.

# Foruddefinerede Konstanter

Tabel 1. MemCache Constants

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

# Runtime Konfiguration

Denne udvidelse har intet konfigurations-direktiv defineret i `php.ini`.

# Ressourcetyper

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

# Eksempler

Eksempel 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.

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