(string) 
			SELECT u.username, u.password, u.email, u.locked
			FROM user AS u 
			WHERE u.user_id = ?
			AND u.status = 1
			LIMIT 1

(string) 
			SELECT u.username, u.password, u.email, u.locked
			FROM user AS u 
			WHERE u.user_id = ?
			AND u.status = 1
			LIMIT 1

MySQLi query has prepared entries, but no types or variables specified!