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PHP header redirect not working when posting a form - using output buffer - but does in other cases?!

Answer 1

+1 A:

Hi Moak,

might be a simple thing. The header() function does set a header, but does not terminate a script so that the header is sent immidiately after calling header().

You need to make php send the script result to the client. As you use output buffering, this result is held back until you trigger your output. Try this instead:

header('Location: '.$filename);
ob_end_flush();
exit();

Regards, Mario

Mario Mueller 2009-04-28 06:26:54

Thanks I tried this, however same result.

Moak 2009-04-28 06:42:13

Answer 2

+2 A:

Did you test that a) the code is reached and b) the error reporting really is in effect?

//Successfully logged in
$_SESSION['logged']=1;

// code reached, error_reporting test
echo 'debug: would send location header', $filename, $unsetVariableTriggeringWarning;
flush();

if (headers_sent()) {
  die('cannot send location header (anymore)');
}
else {
  header('Location: '.$filename);
  die();
}

VolkerK 2009-04-28 06:43:07

got this "would send location header Notice: Undefined variable: unsetVariableTriggeringWarning in /var/kunden/webs/***/pbook.inc.php on line 250" BUT did not get the info saying "cannot send location header (anymore)"

Moak 2009-04-28 07:06:49

Even with flush()? Is there still some ob_xyz()-buffer active? echo 'ob_level: ', ob_get_level(); can tell. Did you use the echo 'debug: would send location header', $filename, $unset... version? I've edited that in later.

VolkerK 2009-04-28 07:19:04

i know the filename is set and correct, as said before the header redirect is exactly the same for login and logout. the only difference is that one is just accessed via link and the other via form submission. i have error_reporting(E_ALL);

Moak 2009-04-28 08:21:57

And what about echo 'ob_level: ', ob_get_level();</i> ? I would place it directly before if(headers_Sent()) for testing

VolkerK 2009-04-28 12:17:13

Answer 3

+1 A:

The line with

die('Command '.$filename);

would probably be the culprit. If the die (or exit) functions (or actually language constructs) take a string as a parameter, it is printed out on the other side before halting. PHP doesn't like you trying to output anything if you are sending headers.

If you are using a reasonably new PHP (>= 4.3.0 iirc), you can use integers 0..255 to mark exit conditions (if you want to), which will not be printed.

Henrik Paul 2009-04-28 06:56:23

in fact this was just added for debugging, with or without text on exit, it doesn't work.

Moak 2009-04-28 06:59:03

Answer 4

+2 A:

I, also, found redirect don't work sometimes after POST request. It is a browser not server-side problem, I think.

I use something like this:

if( sizeof( $_POST ) == 0 ) header( "Location: " . $url );
else echo '<html><head><meta http-equiv="refresh" content="1;url=' . $url . '"/></head><body>Redirecting to ' . $url . '</body></html>'

In short, if it is a POST request - then I use html refresh redirect, else - normal header redirect.

puzz 2009-04-28 07:16:08

hey greate, someone who believes me that it has to do with the POST :) however this is really just happening on one server, not the other. but for now I will use your fix

Moak 2009-04-28 07:26:45

Answer 5

A:

Hi, from my experience you can't send any content when you're doing redirect. So I'd guess your problem is the die() parameter.

I can't find this in documentation right now but try dying() it without a parameter or just use exit; I bet it will work.

jab11 2009-04-28 09:30:45

nope,, sorry I removed the parameter, like i told henrik, exit() die() with or without text. The same code works when it's just a link, not if a form was submitted.

Moak 2009-04-28 12:35:59

Answer 6

A:

Hello, I found same problem: Warning: Cannot modify header information - headers already sent by (output started at E:\xampp\htdocs\php\projects\admin\admin-header.php:12)

arifhossen 2010-01-18 09:24:45

in that case you go to E:\xampp\htdocs\php\projects\admin\admin-header.php and look at line 12

Moak 2010-04-11 07:19:59

Answer 7

A:

**Hi this is abhishek PHP Developer for any query Contact :09582452928

abhishek 2010-02-03 07:17:12

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PHP header redirect not working when posting a form - using output buffer - but does in other cases?!

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