linux：
安装环境
rhel 4
php 5.2.6
所需软件
libevent-1.4.6-stable.tar.gz (http://monkey.org/~provos/libevent/)
memcache-2.2.3.tgz (http://pecl.php.net/package/memcache)
memcached-1.2.6.tar.gz (http://www.danga.com/memcached/)
安装配置
1. 安装libevent
# tar zxf libevent-1.4.6-stable.tar.gz
# cd libevent-1.4.6-stable
# ./configure --prefix=/usr/local/servers/libevent
# make && make install
2. 安装memcached
# tar zxvf memcached-1.2.6.tar.gz
# cd memcached-1.2.6
# ./configure --prefix=/usr/local/servers/memcached --with-libevent=/usr/local/servers/libevent
# make && make install
3. 运行memcached
# /usr/local/servers/memcached -d -m 128 -l localhost -p 11211 -u root
-d 以守护程序（daemon）方式运行 memcached；
-m 设置 memcached 可以使用的内存大小，单位为 m；
-l 设置监听的 ip 地址，如果是本机的话，通常可以不设置此参数；
-p 设置监听的端口，默认为 11211，所以也可以不设置此参数；
-u 指定用户;
如果遇到运行memcached时遇到问题，错误提示如下：
/usr/local/servers/memcached/bin/memcached: error while loading shared libraries: libevent-1.4.so.2: cannot open shared object file: no such file or directory
则运行 ld_dubug=libs 就可以知道memcached启动时库的加载路径。具体如下:
# ld_debug=libs /usr/local/servers/memcached/bin/memcached -v
10929: find library=libevent-1.4.so.2 [0]; searching
10929: search cache=/etc/ld.so.cache
10929: search path=/lib/tls/i686/sse2:/lib/tls/i686:/lib/tls/sse2:/lib/tls:/lib/i686/sse2:/lib/i686:/lib/sse2:/lib:/usr/lib/tls/i686/sse2:/usr/lib/tls/i686:/usr/lib/tls/sse2:/usr/lib/tls:/usr/lib/i686/sse2:/usr/lib/i686:/usr/lib/sse2:/usr/lib (system search path)
10929: trying file=/lib/tls/i686/sse2/libevent-1.4.so.2
10929: trying file=/lib/tls/i686/libevent-1.4.so.2
10929: trying file=/lib/tls/sse2/libevent-1.4.so.2
10929: trying file=/lib/tls/libevent-1.4.so.2
10929: trying file=/lib/i686/sse2/libevent-1.4.so.2
10929: trying file=/lib/i686/libevent-1.4.so.2
10929: trying file=/lib/sse2/libevent-1.4.so.2
10929: trying file=/lib/libevent-1.4.so.2
10929: trying file=/usr/lib/tls/i686/sse2/libevent-1.4.so.2
10929: trying file=/usr/lib/tls/i686/libevent-1.4.so.2
10929: trying file=/usr/lib/tls/sse2/libevent-1.4.so.2
10929: trying file=/usr/lib/tls/libevent-1.4.so.2
10929: trying file=/usr/lib/i686/sse2/libevent-1.4.so.2
10929: trying file=/usr/lib/i686/libevent-1.4.so.2
10929: trying file=/usr/lib/sse2/libevent-1.4.so.2
10929: trying file=/usr/lib/libevent-1.4.so.2
10929:
然后给libevent-1.4.so.2建立一个链接后再运行memcached：
# ln -s /usr/local/servers/libevent/lib/libevent-1.4.so.2 /lib/libevent-1.4.so.2
4. 安装php的memcache扩展
可以使用php自带的pecl安装程序
# /usr/local/servers/php5/bin/pecl install memcache
也可以从源码安装
# tar zxf memcache-2.2.3.tgz
# cd memcache-2.2.3
# /usr/local/servers/php5/bin/phpize
# ./configure --enable-memcache=/usr/local/servers/memcached --with-php-config=/usr/local/servers/php5/bin/php-config --with-apxs2=/usr/sbin/apxs
# make && make inst
安装完后会有类似这样的提示：
installing shared extensions: /usr/local/servers/php5/lib/php/extensions/no-debug-non-zts-20060922/
把这个记住，然后修改php.ini，把
extension_dir = ./
修改为
extension_dir = /usr/local/servers/php5/lib/php/extensions/
并添加一行
extension=no-debug-non-zts-20060922/memcache.so
5. 用phpinfo查看
windows：
下载memcache的windows稳定版，解压放某个盘下面，比如在d:\memcached
2. 在终端（也即cmd命令界面）下输入 d:\memcached\memcached.exe -d install 安装
3. 再输入： c:\memcached\memcached.exe -d start 启动。
note: 以后memcached将作为windows的一个服务每次开机时自动启动。这样服务器端已经安装完毕了。
4.下载php_memcache.dll，请自己查找对应的php版本的文件
5. 在php.ini 加入一行 extension=php_memcache.dll
6.重新启动apache，然后查看一下phpinfo，如果有memcache，那么就说明安装成功！
测试模块
connect('localhost', 12000) or die (could not connect);
$version = $memcache->getversion();
echo server's version: .$version.
\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)
\n;
$get_result = $memcache->get('key');
echo data from the cache:
\n;
var_dump($get_result);
?>
显示结果:
server's version: 1.4.4-14-g9c660c0
store data in the cache (data will expire in 10 seconds)
data from the cache:
object(stdclass)[3] public 'str_attr' => string 'test' (length=4) public 'int_attr' => int 123
----------------
server端的就是memcached，client端可以看作是php_memcache.dll
php_memcache.dll提供了一组函数，用来缓存，提取，删除缓存等一系列的操作，而通过这些函数，最终把数据是放到了安装有memcached服务的机器上，可以是本机，也可以是其它网络上的机器。
memadmin是一个查看memcached服务器的一个小工具，很强大。（用php+jquery写的)
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