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# LXXIX. Memcache Functions

# Einführung

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.

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

# Anforderungen

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

Diese PECL Erweiterung ist nicht Teil von PHP. Zusätzliche Informationen, wie neue Releases, Downloads Quelldateien, Maintainerinformation und ein CHANGELOG finden Sie hier: http://pecl.php.net/package/memcache.

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

Windows users will enable `php_memcache.dll` inside of `php.ini` in order to use these functions. Sie können die DLL für diese PECL Erweiterung entweder von PHP Downloads oder von http://snaps.php.net/ herunterladen.

# Laufzeit Konfiguration

Das Verhalten dieser Funktionen wird durch Einstellungen in der `php.ini` beeinflusst.

Tabelle 1. Memcache Configuration Options

Name | Default | Changeable | Changelog
--- | --- | --- | ---
memcache.allow_failover | "1" | PHP_INI_ALL | Available since Memcache 2.0.2
memcache.chunk_size | "8192" | PHP_INI_ALL | Available since Memcache 2.0.2
memcache.default_port | "11211" | PHP_INI_ALL | Available since Memcache 2.0.2

For further details and definitions of the PHP_INI_* constants, see the Anhang G.

Hier eine kurze Erklärung der Konfigurationsoptionen:

memcache.allow_failover boolean

  Whether to transparently failover to other servers on errors.

memcache.chunk_size integer

  Data will be transfered in chunks of this size, setting the value lower requires more network writes. Try increasing this value to 32768 if noticing otherwise inexplicable slowdowns.

memcache.default_port string

  The default TCP port number to use when connecting to the memcached server if no other port is specified.

# Resource Typen

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

# Vordefinierte Konstanten

Tabelle 2. MemCache Constants

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

# Beispiele

Beispiel 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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