Cookie和Session的区别
http协议是一种无状态的连接,要想跟踪用户的行为就必须有一个能工作于不同于页面的变量，在PHP中可以用cookie和session两种办法实现。
cookie大家比较熟悉了，就是在把变量存为客户端上的一个文件而已，但是如果客户禁止cookie就没办法了。这就需要session了，在PHP4中，session可以有两种办法实现，一是用cookie，即把sessionID保存在cookie文件中；二是把sessionID附带在URL上进行传递。
虽有这两种办法实现，但至于使用哪种方法是不用程序员操心的，PHP会自动检查客户cookie的设置的(指linux/unix平台，Win32未知)，并且默认的是优先使用cookie(你可以修改php.ini文件中的[session]一节的session.use_cookies的值来改变)。当然你也可以强制使用URL来传递SessionID，如下:
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仅在链接中加一句=sessionID;?>就行了，简单吧？在php.ini中还有许多关于Session的设置，如session.cookie_lifetime是session的有效时间等，都在[session]一节中，若看看的话会对PHP中的session有更多的理解的。
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