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apc,eAcceleratormemcache等文件缓存，缓存数据库写入到文件
内存缓存，APC、eAccelerator（php扩展实现）、Memcached、Redis等
数据库缓存，缓存数据写入到数据库
PHP做数据缓存可以用Memcached和Redis. 原理都是先要搭建Memcached或Redis服务器，然后安装php的Memcached/Redis扩展，在PHP代码中通过扩展程序中提供的API就可以连接到Memcached/Redis服务器,在Memcached/Redis上进行数据的存取。就跟PHP安装mysql扩展来连接mysql数据库是一样的道理。