PHP Redirect

murdock75

I have a form that posts back to itself.

When the user hits submit the page is refreshed and this code works:

<?
$conn = odbc_connect($database, $username, $password);
if (isset($GET['action']))
{
if ($GET['action']=="submit")
{
$sOptionValue =$POST["txtValue"];
$sOptionStatus=$POST["chkStatus"];
$iOptionID = $_GET['ID'];
$rs=odbc_exec($conn,"EXEC update_Affiliation ".$iOptionID.",".$sOptionValue.",".$sOptionStatus);
}
}
?>

Now that the data has been saved to the database I want to redirect the user to another form. I have tried using
header() but keep getting an error :

Warning: Cannot add header information - headers already sent by (output started at ...

leatherback

Hi,

The error means exactly what it said: Headers have been already sent.

THat means that you have generated output already to screen, either through an echo or printf statement, or maybe some other errormessages earlier.

Make sure there is no output beforte you try to redirect, and it should work fine.

Drakla

You can only use header before ANY output your script makes, output including any space or HTML before the first php tag, anything included scripts might do, and always exit or die after a redirection so you script doesn't keep churning after you've gone.

murdock75

Well I guess it would be bombing because I have a header file include (but that file includes variables needed to save the data)

Is there another way to redirect the user?

bradgrafelman

It wouldn't be very HTML 4.0 compliant according to W3C, but you could print a META tag in the middle of your page, i.e.

echo '<meta http-equiv="Refresh" content="5; URL=http://www.mysite.com/path/to/file.php">';

The '5' in the content value means wait 5 seconds before redirecting. Adjust the path & delay to suit your needs.

TimTimTimma

As far as headers already sent output buffers help with that :-D

ob_start();

//content here

$content = ob_get_contents();
ob_end_clean();

echo $contents;

its almost like a function, without all the parameters/globals.

Weedpacket

Or rearrange your code so that you generate all the headers you need to before you generate any output (and no, "including a file" is not the same thing as "generating output").

foxmx

use javascript

bradgrafelman

I'd stay away from Javascript as much as possible... just for compatibilty reasons.

Drakla

Javascript is a dirty little boy picking his nose, who only does things when he thinks he'll get an ice cream.

Php header redirects are like the ruby slippers of the internet and you'll find you're back in Kansas before the wicked witch can say "Terrifying monkeys".

ahundiak

Originally posted by murdock75
Well I guess it would be bombing because I have a header file include (but that file includes variables needed to save the data)

Is there another way to redirect the user?

Check for extra spaces following the ?> at then end of your include files. For me at least, this is the most common source of the "header already sent" message.

bradgrafelman

Yep. Remove ANY and ALL line breaks, spaces, etc. outside the <?PHP ?> tags. If you have HTML outside them, put them in an echo() somewhere so you have a chance to send out headers before that HTML is sent.

TimTimTimma's suggestion of output buffering is also ideal, too!

TimTimTimma

its usually the best way to cope with header issues I find :-P

But, like the guys said above, multiple php blocks can cause header issues, thats why I try to make all of my scripts all one php block, and output everything through echo/print