php之Memcache学习笔记
本篇文章是对php中的Memcache进行了详细的分析介绍,需要的朋友参考下
1、win下安装,memcached -d install
win下启动,memcached -d start
关闭,memcached -d stop
1_1、三种方式访问memcache
memcache
memcached
php (不依赖于扩展socket操作)
2、memcache扩展(函数)===访问缓存系统。
安装memcache扩展(C编译的动态链接库)
;启用memcache扩展
extension=php_memcache.dll
3、服务端启动memcached服务
4、PHP中定义类,
建立文件 Person.class.php
在使用的文件中require "Person.class.php",引入定义
5、Memcache中可以存放和获取多种php数据类型
//string int float boolean array object(序列化后的) null resource(如:mysql连接放不进memcache中)
如何resource可以放进去,美国服务器,美国服务器,可以作为连接池。
6、memcache/session/cookie的作用域不同。
cookie 在各浏览器中,保存访问站点的那个商品,浏览过什么,
session 在web服务器上某文件与会话关联,保存登录信息。各自用户只能访问自己的session.
统计在线访问用户(不能使用数据库时)的解决方案:
方案一:遍历session文件个数
方案二:memcached共享缓存(推荐)
7、系统使用多个memcache系统(多个组成分布式存储)memcache自己均衡多个memcached服务器
8、做大型网站的核心技术
1)页面静态化
2)缓存(memcache////)
8-1、memcached的特点
1. 是c/s架构,香港空间,使用简单的文本进行通信。可以多种客户端访问
2. 基于libevent事件处理(java中需要自己处理各种监听,php不怎么监听)
3. 基于内存的缓存,速度更快。
4. 基于客户分布式的。
9、参照memcache各种处理,写自己的缓存系统!!!!

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