session_name() returns the name of the current session.
The session name is reset to the default value stored in
session.name at request startup time. Thus, you need to
call session_name() for every request (and before
session_start() or session_register()
The session name references the session id in cookies and URLs. It should contain only alphanumeric characters; it should be short and descriptive (i.e. for users with enabled cookie warnings). If name is specified, the name of the current session is changed to its value.
The session name can't consist of digits only, at least one letter must be present. Otherwise a new session id is generated every time.
/* set the session name to WebsiteID */
$previous_name = session_name("WebsiteID");
echo "The previous session name was $previous_name<br />";
|The session.name configuration directive|