Get and/or set the current session id - Справочник: PHP5.4

Описание

string session_id ([ string $id ] )

session_id() is used to get or set the session id for the current session.

The constant SID can also be used to retrieve the current name and session id as a string suitable for adding to URLs. See also Session handling.

Список параметров

id: 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 0-9 , (comma) and - (minus)!

Замечание: 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.

Возвращаемые значения

session_id() returns the session id for the current session or the empty string ("") if there is no current session (no current session id exists).

Список изменений

Версия	Описание
5.0.0	The , (comma) and - (minus) characters are allowed in the file session handler.

Смотрите также

session_regenerate_id() - Update the current session id with a newly generated one
session_start() - Initialize session data
session_set_save_handler() - Sets user-level session storage functions
session.save_handler