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Current File : /usr/share/doc/pecl/memcache/README
This is an official repository for pecl-memcache plugin since 2019. 

This repository contains modified pecl-memcache plugin ported to PHP7, 
which was originally developed for the need of hosting company in Slovakia (Websupport.sk). 

The latest release is 4.0.5.1 (released: 2019-12-19) with support for PHP 7.0-7.4. 

See: https://github.com/websupport-sk/pecl-memcache/releases
See also release on PECL: https://pecl.php.net/package/memcache

Feel free to use it and post patches. 



Original README:

memcached module for PHP
------------------------
This module requires zlib library, used for on-the-fly data (de)compression.
Also, you'll need memcached to use it =)

The memcached website is here:
    http://www.danga.com/memcached/

You will probably need libevent to install memcached:
You can download it here: http://www.monkey.org/~provos/libevent/

How to run tests:
1. sh tests/memcache.sh
2. TEST_PHP_EXECUTABLE=/usr/local/bin/php php -dextension=modules/memcache.so run-tests.php -d extension=modules/memcache.so


New API in 3.0
------------------------

 Version 3 introduces a new class "MemcachePool" which implements the new API, the 
 old class "Memcache" is still retained (but is deprecated) with the same interface 
 for backwards compatibility. Please note that you need a new memcached version to
 use the CAS, default value to increment/decrement, append and prepend, and binary 
 protocol features.

 New INI directives are available to allow control over protocol, redundancy and hash
 strategy selection. These are
 
	# The binary protocol results in less traffic and is more efficient
	# for the client and server to generate/parse

	memcache.protocol = {ascii, binary}		# default ascii

	# When enabled the client sends requests to N servers in parallel, resulting in
	# a somewhat crude reduncancy or mirroring, suitable when used as a session 
	# storage. 
	#
	# If data integrity is of greater importance a real replicating memcached 
	# backend such as "repcached" (http://sourceforge.net/projects/repcached/) is 
	# recommended

	memcache.redundancy = <int>			# default 1
	memcache.session_redundancy = <int>		# default 2

	# Hash strategy and function selection. The consistent hashing strategy
	# is now the default as it allows servers to be added and removed from
	# the pool without resulting in all or most keys being re-mapped to 
	# other server (ie. voiding the cache)

	memcache.hash_strategy = {standard, consistent}	# default consistent
	memcache.hash_function = {crc32, fnv}			# default crc32
	
	# Compression is enabled by default, the threshold which control the minimum 
	# string length which triggers compresssion can be changed as
	
	memcache.compress_threshold = <int>		# default 20000


 The directives are used by the MemcachePool constructor so you can instantiate 
 several pools with different settings by using ini_set() creativly. For example
 
	ini_set('memcache.protocol', 'binary');

	$binarypool = new MemcachePool();
	$binarypool->addServer(...)

	ini_set('memcache.protocol', 'ascii');
	ini_set('memcache.redundancy', '2');

	$redundantpool = new MemcachePool();
	$redundantpool->addServer(...)

	ini_set('memcache.redundancy', '1');
 

 The new interface looks like 

class MemcachePool() {
	bool connect(string host, int tcp_port = 11211, int udp_port = 0, bool persistent = true, int weight = 1, int timeout = 1, int retry_interval = 15)
	bool addServer(string host, int tcp_port = 11211, int udp_port = 0, bool persistent = true, int weight = 1, int timeout = 1, int retry_interval = 15, bool status = true)
	bool setServerParams(string host, int tcp_port = 11211, int timeout = 1, int retry_interval = 15, bool status = true)
	
	/**
	 * Supports fetching flags and CAS values
	 */
	mixed get(mixed key, mixed &flags = null, mixed &cas = null)
	
	/**
	 * Supports multi-set, for example
	 *  $memcache->set(array('key1' => 'val1', 'key2' => 'val1'), null, 0, 60)
	 */
	bool add(mixed key, mixed var = null, int flag = 0, int exptime = 0)
	bool set(mixed key, mixed var = null, int flag = 0, int exptime = 0)
	bool replace(mixed key, mixed var = null, int flag = 0, int exptime = 0)
	
	/**
	 * Compare-and-Swap, uses the CAS param from MemcachePool::get() 
	 */
	bool cas(mixed key, mixed var = null, int flag = 0, int exptime = 0, int cas = 0)
	
	/**
	 * Prepends/appends a value to an existing one
	 */
	bool append(mixed key, mixed var = null, int flag = 0, int exptime = 0)
	bool prepend(mixed key, mixed var = null, int flag = 0, int exptime = 0)
	
	/**
	 * Supports multi-key operations, for example
	 *  $memcache->delete(array('key1', 'key2'))
	 */
	bool delete(mixed key, int exptime = 0)

	/**
	 * Supports multi-key operations, for example
	 *  $memcache->increment(array('key1', 'key2'), 1, 0, 0)
	 *
	 * The new defval (default value) and exptime (expiration time) are used
	 * if the key doesn't already exist. They must be supplied (even if 0) for
	 * this to be enabled.
	 *
	 * Returns an integer with the new value if key is a string
	 * Returns an array of integers if the key is an array
	 */
	mixed increment(mixed key, int value = 1, int defval = 0, int exptime = 0)
	mixed decrement(mixed key, int value = 1, int defval = 0, int exptime = 0)
	
	/**
	 * Assigns a pool-specific failure callback which will be called when 
	 * a request fails. May be null in order to disable callbacks. The callback
	 * receive arguments like
	 *
	 *  function mycallback($host, $tcp_port, $udp_port, $error, $errnum)
	 *
	 * Where $host and $error are strings or null, the other params are integers.
	 */
	bool setFailureCallback(function callback)
	
	/**
	 * Locates the server a given would be hashed to
	 * 
	 * Returns a string "hostname:port" on success
	 * Returns false on failure such as invalid key
	 */
	string findServer(string key)
}


Maintainers:
Herman J. Radtke III	hradtke at php dot net
Anon7 - 2022
AnonSec Team