再简单的事情没有做一遍都不能明白其中时候如此，今天配置Memcached就发现这个问题。帮助很全，先是在memcached for Windows获取到了需要的win下面的Memcached,按照方法：
引用
Unzip the binaries in your desired directory (eg. c:memcached)
Install the service using the command: 'c:memcachedmemcached.exe -d install' from the command line
Start the server from the Microsoft Management Console or by running the following command: 'c:memcachedmemcached.exe -d start'
Use the server, by default listening to port 11211
然后
在php.ini 加入一行 'extension=php_memcache.dll'
然后到 http://pecl4win.php.net/ext.php/php_memcache.dll获取php_memcache.dll
并复制到 ext 中（记住版本不要错了！）
重启Apache,发现PHPInfo就是提示出不来memcache，真是无语了，代码测试总是提示
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Fatal error: Class 'Memcache' not found in D:xampplitehtdocsmemcacheindex.php on line 20
开始觉得奇怪，于是搜索在官方网站发现了http://www.php.net/manual/zh/ref.memcache.php
Hi there:
For run memcached in a windows box: (tested with latest php,apache and memcache in xp sp2)
a) download the php_memcache.dll it can be found in the pecl file.
b) put the dll in the extension folder (c:/php/extension for example). You cannot miss this folder because they are filled with php*.dll files. In some cases the extension folder used is the system32, a non-standard way to put dll but still works.
c)configure the php.ini
; i put this like the latest extension
extension=php_memcache.dll
; i'm not sure about this but don't hurts..
[Memcache]
memcache.allow_failover = 1
memcache.max_failover_attempts=20
memcache.chunk_size =8192
memcache.default_port = 11211
d)This is important, memcached works with a EXTERNAL service. This service must be downloaded and installed prior to use the memcache. I use: http://jehiah.cz/projects/memcached-win32/
e)Remember to install the service and to start the service memcached.exe -d install for install and run services.msc for start the memcached service (or restart the system).
f) check the firewall ports.
Finally restart the apache/iis and runs some test. At least in phpinfo must show some info about the memcache.
Final notes :The "awe" about memcache is not only can help for speed some process (or reduce the cpu use), also can be used like a global session for store a whole object also this "global session" is shared among all the users, like APPLICATION used in ASP. So (for example) it's possible to do a user counter without needing of database or writing a file.
试试态度加上看了一下，看到了熟悉的东西了：
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$mem=newMemcache;
$mem->connect('127.0.0.1',11211);
$mem->set('key','Thisisatest!',0,60);
$val=$mem->get('key');
echo$val;
$mem = new Memcache;
$mem->connect('127.0.0.1', 11211);
$mem->set('key', 'This is a test!', 0, 60);
$val = $mem->get('key');
echo $val;
在浏览器输出了
This is a test!
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Memcached 本身的启动过程，在 memcached.c 的 main 函数中顺序如下：
1 、调用 settings_init() 设定初始化参数
2 、从启动命令中读取参数来设置 setting 值
3 、设定 LIMIT 参数
4 、开始网络 socket 监听（如果非 socketpath 存在）（ 1.2 之后支持 UDP 方式）
5 、检查用户身份（ Memcached 不允许 root 身份启动）
6 、如果有 socketpath 存在，开启 UNIX 本地连接（Sock 管道）
7 、如果以 -d 方式启动，创建守护进程（如上调用 daemon 函数）
8 、初始化 item 、 event 、状态信息、 hash 、连接、 slab
9 、如设置中 managed 生效，创建 bucket 数组
10 、检查是否需要锁定内存页
12 、如果 daemon 方式，处理进程 ID
13 、event 开始，启动过程结束， main 函数进入循环。