自从有了各种移动应用的APP，我发博客的时间都被切碎了。

刚有点想写博客的冲动，就被一个APP的NOTIFICATION打断。

刚想整理一下一次活动和行程的照片，又发现在这些照片已经部份发布在各大即时媒 体与图片应用中。

刚想写点什么，又发现在不如拍个照片方便，图片应用成熟度还在提升；

刚想写点最近员工沟通方面的心得，却又发现在员工沟通那一刻的冲动已经有微博上别人的一句精典警句所表达；

刚刚产生一点新的IDEA，发现在APP STORE上已经遍地开花了；

刚想考虑一下技术问题，边上孩子在叫了：爸爸，要玩小火车。。。

一，WHY we install memcached扩展 for php5

memcached的1.2.4及以上增加了CAS(Check and Set)协议

php的扩展memcache，不支持cas，所以要装memcached扩展(http://pecl.php.net/package/memcached )，memcached扩展是基于libmemcached，所以要先安装libMemcached(http://libmemcached.org/libMemcached.html)；

libMemcached is designed to provide the greatest number of options to use Memcached. Some of the features provided:

1. Asynchronous and Synchronous Transport Support.
   
2. Consistent Hashing and Distribution.
   
3. Tunable Hashing algorithm to match keys.
   
4. Access to large object support.
   
5. Local replication.
   
6. A complete reference guide and documentation to the API.
   
7. Tools to Manage your Memcached networks.
   

Memcached()支持getMulti()和setMulti(),即存取一个ID LIST，分页列表中的一些统计数据CACHE是很好的应用场景；

 

二，查看memcahced的版本

 

telnet 127.0.0.1 11211

stats

+++++++++++

STAT pid 1000

STAT uptime 22415

STAT time 1322297562

STAT version 1.4.5

STAT pointer_size 32

STAT rusage_user 4.793271

STAT rusage_system 17.905277

STAT curr_connections 6

STAT total_connections 140122

STAT connection_structures 25

STAT cmd_get 191367

STAT cmd_set 22226

STAT cmd_flush 0

STAT get_hits 169139

STAT get_misses 22228

STAT delete_misses 1935

STAT delete_hits 679

STAT incr_misses 0

STAT incr_hits 0

STAT decr_misses 0

STAT decr_hits 0

STAT cas_misses 0

STAT cas_hits 0

STAT cas_badval 0

STAT auth_cmds 0

STAT auth_errors 0

STAT bytes_read 37556795

STAT bytes_written 1165861842

STAT limit_maxbytes 268435456

STAT accepting_conns 1

STAT listen_disabled_num 0

STAT threads 4

STAT conn_yields 0

STAT bytes 1498608

STAT curr_items 1597

STAT total_items 22226

STAT evictions 0

STAT reclaimed 16075

END

如果版本过低，考虑重新装一下

 

退出telnet ，ctrl + ] 然后在按q就行了。

 

三，下载所需源码

Visit: https://launchpad.net/libmemcached/+download

wget http://launchpad.net/libmemcached/1.0/0.42/+download/libmemcached-0.42.tar.gz

vist: http://pecl.php.net/package/memcached

wget http://pecl.php.net/get/memcached-2.0.0b2.tgz

 

memcached server side的官方网站 http://www.memcached.org/

 

四，安装libmemcached

tar zxvf libmemcached-0.42.tar.gz

cd libmemcached-0.42

./configure –prefix=/usr/local/libmemcached –with-memcached

make && make install

五，php的扩展memcached的安装

 

tar zxvf memcached-1.0.2.tar.gz

cd memcached-2.0.0

/usr/local/php/bin/phpize

./configure –enable-memcached –with-php-config=/usr/local/php/bin/php-config –with-libmemcached-dir=/usr/local/memcached

./configure –prefix=/usr/local/phpmemcached –with-memcached –with-php-config=/usr/local/php/bin/php-config –with-libmemcached-dir=/usr/local/bmemcached

make && make install

 

###############

Build complete.

Don’t forget to run ‘make test’.

 

Installing shared extensions: /usr/local/php/lib/php/extensions/no-debug-non-zts-20090626/

linux-3q12:/home/yejun/memcached-2.0.0b2 # cd /usr/local/php/lib/php/extensions/no-debug-non-zts-20090626/

#################

vi /usr/local/php/lib/php.ini

在文件最后几行加上extension=memcached.so重起一下HTTP服务，如：apachectl restart就可以了。

 

 

<?php

Phpinfo();

?>

看看效果，上面是老的MEMCACHE模块，下面是新扩展的：

六：看看新的接口


Memcached — The Memcached class

• Memcached::add — Add an item under a new key
  
• Memcached::addByKey — Add an item under a new key on a specific server
  
• Memcached::addServer — Add a server to the server pool
  
• Memcached::addServers — Add multiple servers to the server pool
  
• Memcached::append — Append data to an existing item
  
• Memcached::appendByKey — Append data to an existing item on a specific server
  
• Memcached::cas — Compare and swap an item
  
• Memcached::casByKey — Compare and swap an item on a specific server
  
• Memcached::__construct — Create a Memcached instance
  
• Memcached::decrement — Decrement numeric item’s value
  
• Memcached::delete — Delete an item
  
• Memcached::deleteByKey — Delete an item from a specific server
  
• Memcached::fetch — Fetch the next result
  
• Memcached::fetchAll — Fetch all the remaining results
  
• Memcached::flush — Invalidate all items in the cache
  
• Memcached::get — Retrieve an item
  
• Memcached::getByKey — Retrieve an item from a specific server
  
• Memcached::getDelayed — Request multiple items
  
• Memcached::getDelayedByKey — Request multiple items from a specific server
  
• Memcached::getMulti — Retrieve multiple items
  
• Memcached::getMultiByKey — Retrieve multiple items from a specific server
  
• Memcached::getOption — Retrieve a Memcached option value
  
• Memcached::getResultCode — Return the result code of the last operation
  
• Memcached::getResultMessage — Return the message describing the result of the last operation
  
• Memcached::getServerByKey — Map a key to a server
  
• Memcached::getServerList — Get the list of the servers in the pool
  
• Memcached::getStats — Get server pool statistics
  
• Memcached::getVersion — Get server pool version info
  
• Memcached::increment — Increment numeric item’s value
  
• Memcached::prepend — Prepend data to an existing item
  
• Memcached::prependByKey — Prepend data to an existing item on a specific server
  
• Memcached::replace — Replace the item under an existing key
  
• Memcached::replaceByKey — Replace the item under an existing key on a specific server
  
• Memcached::set — Store an item
  
• Memcached::setByKey — Store an item on a specific server
  
• Memcached::setMulti — Store multiple items
  
• Memcached::setMultiByKey — Store multiple items on a specific server
  
• Memcached::setOption — Set a Memcached option
  

七：使用场景

public mixed
Memcached::getMulti ( array $keys [, array &$cas_tokens [, int $flags ]] )

Memcached::getMulti() is similar to Memcached::get(), but instead of a single key item, it retrieves multiple items the keys of which are specified in the keys array. If cas_tokens variable is provided, it is filled with the CAS token values for the found items.

Note:

Unlike Memcached::get() it is not possible to specify a read-through cache callback for Memcached::getMulti(), because the memcache protocol does not provide information on which keys were not found in the multi-key request.

<?php
$m = new Memcached();
$m->addServer(‘localhost’, 11211);

$items = array(
    ‘key1′ => ‘value1′,
    ‘key2′ => ‘value2′,
    ‘key3′ => ‘value3′
);
$m->setMulti($items);
$result = $m->getMulti(array(‘key1′, ‘key3′, ‘badkey’), $cas);
var_dump($result, $cas);
?>

 

 

<?php
$m = new Memcached();
$m->addServer(‘localhost’, 11211);

$items = array(
    ‘key1′ => ‘value1′,
    ‘key2′ => ‘value2′,
    ‘key3′ => ‘value3′
);
$m->setMulti($items, time() + 300);
?>

在同事家里看烟花，一线江景，黄金展位。回味一下。

 

 

 

 

 

 

地点：http://j.map.baidu.com/uTn2J

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