LXXXIV. Memcache Functions
Wstęp
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 https://www.danga.com/memcached/.
Wymagania
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.
Instalacja
To rozszerzenie PECL nie jest dołączane do PHP. Informacje na temat instalacji tego rozszerzenia PECL można znaleźć w podręczniku w rozdziale zatytułowanym Instalacja rozszerzeń PECL. Dodatkowe informacje, takie jak nowe wersje, pliki do pobrania, pliki źródłowe, informacje o opiekunach czy rejestr zmian, można znaleźć tutaj: https://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. DLL z tym rozszerzeniem PECL można pobrać ze strony PHP Downloads lub https://snaps.php.net/.
Konfiguracja uruchomieniowa
Na działanie tych funcji wpływają ustawienia zawarte w pliku php.ini.
Tabela 1. Memcache Configuration Options
Name | Default | Changeable | Changelog |
---|---|---|---|
memcache.allow_failover | "1" | PHP_INI_ALL | Available since Memcache 2.0.2 |
memcache.max_failover_attempts | "20" | PHP_INI_ALL | Available since Memcache 2.1.0 |
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 |
Oto krótkie wyjaśnienie dyrektyw konfiguracji.
memcache.allow_failover
booleanWhether to transparently failover to other servers on errors.
memcache.max_failover_attempts
integerDefines how many servers to try when setting and getting data. Used only in conjunction with memcache.allow_failover.
memcache.chunk_size
integerData will be transferred 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
stringThe default TCP port number to use when connecting to the memcached server if no other port is specified.
Typy zasobów
There is only one resource type used in memcache module - it's the link identifier for a cache server connection.
Stałe predefiniowane
Tabela 2. MemCache Constants
Name | Description |
---|---|
MEMCACHE_COMPRESSED (integer) | Used to turn on-the-fly data compression on with Memcache::set(), Memcache::add() i Memcache::replace(). |
Przykłady
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.
- Spis treści
- 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::getServerStatus -- Returns server status
- 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
- Memcache::setServerParams -- Changes server parameters and status at runtime
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