PHP usage Summary: (2) solutions for PHP session_start () Warning

This problem always occurs when session_start () is used.

 

Warning: Session_start () [function. session-start]: Cannot send session cookie-headers already sent by (output started at/home/u114264/include/db_mysql.class.php: 1) in /Home/u114264/login1.phpOn line 3

Warning: Session_start () [function. session-start]: Cannot send session cache limiter-headers already sent (output started at/home/u114264/include/db_mysql.class.php: 1) in/Home/u114264/login1.phpOn line3

Address solution.

The most common solution. Enable output_buffering = 4096 or On; global properties.

 

Solution 2.

 

Ob_start: Open the output buffer.
Function Format: void ob_start (void)
Note: When the buffer zone is activated, all non-file header information from the PHP program is not sent, but stored in the internal buffer zone. To output the buffer content, you can use ob_end_flush () or flush () to output the buffer content.

 

 

Note:

 

If you use UTF-8 encoding, be sure to remove the BOM in the UTF-8, this is because the UTF-8 encoding file contains the bom, and php4, 5 are not supported bom. Remove bom and use Notepad ++ to open the conversion.