Allow this user to claim this identity, and allow the consumer to have this information?
string
$server_url:
DEPRECATED. Passing $op_endpoint to the Auth_OpenID_Server constructor makes this optional.
When an OpenID 1.x immediate mode request does not succeed, it gets back a URL where the request may be carried out in a not-so-immediate fashion. Pass my URL in here (the fully qualified address of this server's endpoint, i.e. http://example.com/server), and I will use it as a base for the URL for a new request.
Optional for requests where $immediate is false or $allow is true.
string
$identity:
The OP-local identifier to answer with. Only for use when the relying party requested identifier selection.
string
$claimed_id:
The claimed identifier to answer with, for use with identifier selection in the case where the claimed identifier and the OP-local identifier differ, i.e. when the claimed_id uses delegation.
If $identity is provided but this is not, $claimed_id will default to the value of $identity. When answering requests that did not ask for identifier selection, the response $claimed_id will default to that of the request.