1、安装libmemcached库

      yum install libmemcached

2、下载并解压memcache文件

     wget http://pecl.php.net/get/memcache-3.0.8.tgz  

     tar xzvf memcache-3.0.8.tgz  

     cd memcache-3.0.8

3、执行phpize扩展安装程序，假设phpzie的路径为/usr/local/php/bin/phpize,具体的路径得根据自己的环境修改。

[root@naginx memcache-3.0.8]# /usr/local/php/bin/phpize

Configuring for:

PHP Api Version:         20100412

Zend Module Api No:      20100525

Zend Extension Api No:   220100525

4、开始安装扩展memcache

 [root@naginx memcache-3.0.8]# ./configure --enable-memcache \

   --with-php-config=/usr/local/php/bin/php-config --with-zlib-dir \ 

make && make install  

安装完成后，提示

Build complete.

Don't forget to run 'make test'.

Installing shared extensions:     /usr/local/php/lib/php/extensions/no-debug-non-zts-20100525/

5、最后修改php.ini文件，在zend之前加入如下代码。

vim /usr/local/php/lib/php.ini

extension=/usr/local/php/lib/php/extensions/no-debug-non-zts-20100525/memcache.so

6、重新启动php-fpm

kill -QUIT pid

/usr/local/php/sbin/php-fpm

7、通过phpinfo（）可以查看memcached信息

8、启动memecached

 ./memcached -d -m 100 -l 192.168.1.120 -p 11211 -u root

9、测试

附php的memcache测试代码：

$mem = new Memcache;

$mem->connect("192.168.1.120", 11211)  or die("Could not connect");

$version = $mem->getVersion();

echo "Server's version: ".$version."
\n";

$mem->set('hellokey', 'Hello World', 0, 600) or die("Failed to save data at the memcached server");

echo "Store data in the cache (data will expire in 600 seconds)
\n";

$get_result = $mem->get('hellokey');

echo "$get_result is from memcached server.";        

?>

查看命中结果

telnet 192.168.1.120 11211

输入命令：status

memcached 缓存信息查看（主要是discuz 3（修改config_global.php的memcached配置信息）设置完成后的缓存信息）

stats cachedump 1 0

ITEM hellokey [11 b; 1441724619 s]

ITEM 8bwmS2_home_follow_2 [6 b; 1441810396 s]

ITEM 8bwmS2_pluginlanguage_system [0 b; 1441710021 s]

ITEM 8bwmS2_cronnextrun [10 b; 1441710021 s]

ITEM 8bwmS2_userapp [6 b; 1441710021 s]

ITEM 8bwmS2_magic [6 b; 1441710021 s]

ITEM 8bwmS2_attachtype [6 b; 1441710021 s]

ITEM 8bwmS2_relatedlink [6 b; 1441710021 s]

ITEM 8bwmS2_posttable_info [0 b; 1441710021 s]

ITEM 8bwmS2_threadtable_info [0 b; 1441710021 s]

ITEM 8bwmS2_plugin [6 b; 1441710021 s]

ITEM 8bwmS2_threadtableids [0 b; 1441710021 s]

ITEM 8bwmS2_domainwhitelist [6 b; 1441710021 s]

ITEM 8bwmS2_albumcategory [6 b; 1441710021 s]

ITEM 8bwmS2_forum_guide [6 b; 1441710021 s]

ITEM 8bwmS2_historyposts [3 b; 1441710021 s]

ITEM 8bwmS2_heats [6 b; 1441710021 s]

ITEM 8bwmS2_announcements [6 b; 1441710021 s]

ITEM 8bwmS2_adminmenu [6 b; 1441710021 s]