session_id
(PHP 4 )
session_id -- Get and/or set the current session id
Description
string session_id ( [string id])
session_id() returns the session id for the current session.
If id is specified, it will replace the current session
id. session_id() needs to be called before session_start()
for that purpose. Depending on the session handler, not
all characters are allowed within the session id. For example,
the file session handler only allows characters in the range
a-z, A-Z and 0-9!
Note: When using session cookies, specifying an id for
session_id() will always send a new cookie when session_start()
is called, regardless if the current session id is identical
to the one being set.
The constant SID can also be used to retrieve the current
name and session id as a string suitable for adding to URLs.
Note that SID is only defined if the client didn't send
the right cookie. See also Session handling.
See also session_start(), session_set_save_handler(), and
session.save_handler.
session_is_registered
(PHP 4 )
session_is_registered -- Find out whether a global variable
is registered in a session
Description
bool session_is_registered ( string name)
session_is_registered() returns TRUE if there is a global
variable with the name name registered in the current session.
Note: If $_SESSION (or $HTTP_SESSION_VARS for PHP 4.0.6
or less) is used, use isset() to check a variable is registered
in $_SESSION.
Caution
If you are using $_SESSION (or $HTTP_SESSION_VARS), do not
use session_register(), session_is_registered() and session_unregister().
