不同浏览器session_id雷同的可能性？
不同浏览器session_id相同的可能性？？？？
我一直知道的是session_id绝对唯一。
但在做一个二级域名的session共享的时候，发现一个问题：用户第一次访问时，将session_id保存到cookie，cookie有效期设置为一天,然后用户退出。在30分钟后，服务器的session被销毁，而此时用户携带被保存在cookie的session_id访问。。在服务器端，为了二级域名共享session_id,做了一个判断：只要存在$_COOKIE['session_id']，就使用session_id()函数直接访问服务器的session。。
那么问题就出现了，此时用户传递的session_id，对应的session已经被销毁了。那么此时服务器是否可能存在一个session，它的session_id恰好是用户传递的$_COOKIE['session_id']呢？？？
注：服务器销毁session后，自然会忽略掉该session对应的session_id。那么也就可能服务器再次生成这个session_id分配给另外的session。
求大礼赐教，不胜感激！！！！！
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