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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

NameDefaultChangeableChangelog
memcache.allow_failover"1"PHP_INI_ALLAvailable since Memcache 2.0.2
memcache.chunk_size"8192"PHP_INI_ALLAvailable since Memcache 2.0.2
memcache.default_port"11211"PHP_INI_ALLAvailable 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

NameDescription
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.

Inhaltsverzeichnis
Memcache::add -- Add an item to the server
Memcache::addServer -- Add a memcached server to connection pool
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::getExtendedStats -- Get statistics from all servers in pool
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
Memcache::setCompressThreshold -- Enable automatic compression of large values
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