如果你的网站访问路劲是这样的：www.2cto.com
如果你这样设置 set_cookie('a', 'a') 的话，在google浏览器下会遇到一个隐藏的BUG，域的问题
解决方案：
[php]
setcookie("名称", '值', NULL, '/')
作者：initphp
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