session_id()

session_id - Get and/or set the current session id

Syntax

string session_id (string $id)

Arguments

• 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)! 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.

Description

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

Version

PHP 4, 5

Return value

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).