note 61840 added to function.session-id

Any one knows how unique a session_id may be? I just wonder if it is possible that the same session_id is generated once again over time? ---- Server IP: 83.137.200.2 Probable Submitter: 85.167.89.17 ---- Manual Page -- http://www.php.net/manual/en/function.session-id.php Edit -- http://master.php.net/manage/user-notes.php?action=edit+61840 Delete: added to the manual -- http://master.php.net/manage/user-notes.php?action=delete+61840&report=yes&reason=added+to+the+manual Delete: bad code -- http://master.php.net/manage/user-notes.php?action=delete+61840&report=yes&reason=bad+code Delete: spam -- http://master.php.net/manage/user-notes.php?action=delete+61840&report=yes&reason=spam Delete: useless -- http://master.php.net/manage/user-notes.php?action=delete+61840&report=yes&reason=useless Delete: non-english -- http://master.php.net/manage/user-notes.php?action=delete+61840&report=yes&reason=non-english Delete: already in docs -- http://master.php.net/manage/user-notes.php?action=delete+61840&report=yes&reason=already+in+docs Delete: other reasons -- http://master.php.net/manage/user-notes.php?action=delete+61840&report=yes Reject -- http://master.php.net/manage/user-notes.php?action=reject+61840&report=yes Search -- http://master.php.net/manage/user-notes.php