Help with this error msg..

[kevinkhan]

Im getting this error message when i run a script.

 

Warning: Cannot modify header information - headers already sent by (output started at C:\Program Files\Apache Software Foundation\Apache2.2\htdocs\widgetCorp\stage5\includes\connection.php:17) in C:\Program Files\Apache Software Foundation\Apache2.2\htdocs\widgetCorp\stage5\create_subject.php on line 18

 

what does this actually mean?

 

THis is the code  in create_subject.php

 

$query = "INSERT INTO subjects (
              menu_name, position, visible
              ) VALUES (
                '{$menu_name}', {$position}, {$visible}
              )";
        if(mysql_query($query, $connection))
          {
            // Success
            header("Location: content.php");
            exit; 
            // always need exit when sending header information
          }
        else
          {
          // Display error message
          echo "<p>Subject creation failed.</p>";
          echo "<p>" . mysql_error() . "</p>";
          }

 

 

Thanks for any help given..

[Daniel0]

It means what it says: You cannot modify headers when output has been sent. That's just the way HTTP works. Headers are at the top (hence the name "header").

 

The solution: Don't output anything before you're certain you don't need to send any more headers.

[PFMaBiSmAd]

And since the error message states where the output is occurring at that is preventing the headers from working -

output started at ....\connection.php:17 (line 17)

 

You would need to determine what connection.php is doing on line 17 that is producing output and either eliminate it (assuming it is unintentional) or rearrange your logic (assuming the output is intentional) so that the output occurs after the header() statement or the header() statement is before the code sending the output.