PHP cookie与session的问题
PHP里，cookie与session相比，除了cookie保存在客户端，不占用服务端的硬盘外，还有啥优点？
PHP处理页面的时候，都是在服务端生成好页面后才发送给客户端，要是把数据缓存在cookie里，就要先把数据发送到客户端，下次访问的时候，再把保存在客户端cookie里的数据发送到服务端，处理后再回发给客户端……这样好像就要比用session缓存数据多了2次传送数据的过程？(session只是在服务器上读取，免去了网络传输？)
不知道这样理解对不对？要是真是这样的话，感觉用cookie缓存数据就没啥优势了……
恳请各位不吝赐教～
谢谢！
（有没有一种稍微简单的，把数据缓存在客户端，服务器处理php文件时不用从客户端再次读取，而是由客户端自动进行处理的技术啊？就是服务器在页面中需要缓存数据的地方留下标记，客户端读取到该标记的时候就去加载缓存的数据……）
------解决方案--------------------
如果把数据都保存在session 当然可以，前提是你是否有足够多的内存支持？
你说的可以使用js+cookie来实现，不过有个问题是cookie所能保存的内容也是有限的.另外也容易伪造
------解决方案--------------------
COOKIE是暴漏的啊，不安全啊，客户端编什么服务器信什么不就蛋疼了。
COOKIE就是一个可退化的会话技术，有没有都不会影响服务端的逻辑与安全。
如果一个用户登录以后，你发给用户一个COOKIE来标记用户已登录，那完蛋了。。
坏人只要分析出这个COOKIE的格式，用任何账号名都能编造出来，还玩毛啊。。
只要客户端能直接触碰的东西都是不安全的。
------解决方案--------------------
那么你如何在大量的缓存数据中删去已被删除的记录的相关内容呢？
特别是 每次查询数据库都涉及到大量的联合、笛卡尔积等操作的话 结果集的内容可能出现很大的变化（与被删除记录相关的联合、笛卡尔积部分都不存在了）
------解决方案--------------------
再者说 SESSION、COOKIE 是属于用户私有的
而删除记录是公有的事件，你总不能说甲删除记录时对乙就无效吧
假定现在有一万个用户在线，你打算如何去更新他们的缓存呢？
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