If you are get warning message on your website page like this "Warning: session_start(): Cannot send session cache limiter - headers already sent
(output started at file_address.php:13) in file_address2.php on line 2". Then here the silution for it. This problem is arrived due to mis place of "session_start()" function. You can resolve this problem by simply put "session_start()" function at the top most of your codes. According to PHP guidelines, it must be place before any output php code lines. To know more about "session_start()" function go to php.net/manual/en/function.session-start.php