php，为什么两个浏览器的会话ID是相同的？

I have a site, when I log in with the same user with two browsers, the session_id() tells me the same value. Isnt it wrong? How to distinguish the two users?

UPDATE/EDIT: Google Chrome seems to have a SERIOUS issue with exactly what you wrote, see this Chrome is creating duplicate sessions with the same id and http://code.google.com/p/webug/issues/detail?id=12 for more info.

My older answer:

If you are REALLY using two different browsers, then you are probably

  1. using are NON-server-based session script OR
  2. you are providing the session via something (url parameter ?) OR
  3. you are using a very strange session system (yes, i have seen that) which tracks users by their IPs.

Typical PHP sessions are created as files on the server filesystem, so a "new browser" does not know about this session and the browser has no info about you that it could send to the server.

If you want a REAL answer, show some code, dude.