session_id
Get and/or set the current session id
Description
stringfalse session_id(stringnull $id = null)
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.
Parameters
-
id
-
If id is specified and not null, 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-zA-Z0-9,-]!
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.
Return Values
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).
On failure, false is returned.