Allow modules to modify the OpenID request parameters.
$op: The operation to be performed. Possible values:
$request: An associative array of parameter defaults to which to modify or append.
An associative array of parameters to be merged with the default list.
function hook_openid($op, $request) {
if ($op == 'request') {
$request['openid.identity'] = 'http://myname.myopenid.com/';
}
return $request;
}