Retrieve a NameID into from database.
public static get ( string $idpEntityId, string $spEntityId, string $user ) : string | null | ||
$idpEntityId | string | The IdP entityID. |
$spEntityId | string | The SP entityID. |
$user | string | The user's unique identificator (e.g. username). |
return | string | null | $value The NameID value, or NULL of no NameID value was found. |