189      * @param   string $user Username
195     public function trustExternal($user, $pass, $sticky = false)  argument
227      * @param   string $user the user name
231     public function checkPass($user, $pass)  argument
248      * @param   string $user the user name
252     public function getUserData($user, $requireGroups = true)  argument
270      * @param  string $user
277     public function createUser($user, $pass, $name, $mail, $grps = null)  argument
289      * @param   string $user nick of the user to be changed
293     public function modifyUser($user, $changes)  argument
401      * @param string $user username
404     public function cleanUser($user)  argument
406         return $user;
450      * @param  string $user - The username
454     public function useSessionCache($user)  argument