How to Fix Can not modify header information – headers already sent
Sometimes you get an error "Can not modify header information - headers already sent by (output started at C: \ wamp \ www \ gau_bong25 \ gio_hang \ them_sm.php: 39) in C: \ wamp \ www \ gau_bong25 \ gio_hang \ them_sm . php on line 40 "?
In php this...