[RESOLVED] problem!! Cannot modify header information - headers already sent

petergi

I have the following site in 2 different hosts.in first no problem at all. In second (bluehostia) thought the site says when you try to load it the following :
Warning: Cannot modify header information - headers already sent by (output started at /home2/winninj3/public_html/index.php:12) in /home2/winninj3/public_html/index.php on line 15
Test cookie not sent

why is this happening? please if anyone can help i ve spend many hours searching and nothing 🙁

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html><head><title>The test page! </title>
<META NAME="keywords" CONTENT="test page, test, page">
<META NAME="description" CONTENT="Test page">
<META NAME="ROBOTS" CONTENT="ALL">
</head>
<body>
<div>
<table width="339" border="0" align="left">
<tr>
<td width="333">Visitors :
<?php
function cookies_enabled()
{
$cookie_sent = setcookie('tc','ok',time()+3600);
if($cookie_sent == false){die('Test cookie not sent');}
$redirected = (isset($GET['cs']) && $GET['cs'] == '1' ? $GET['cs'] : '0');
if($redirected == '0')
{
header('Location: '.$SERVER['PHP_SELF'].'?cs=1');return;//or should I put exit() ?
}
return (isset($COOKIE['tc']) && strcmp($COOKIE['tc'],'ok') === 0);
}
if(cookies_enabled())include("ccode.php");
else echo 'please enable cookies to count 🙂';
?>
</td>
</tr>
</table>
</div>
</body>
</html>

bradgrafelman

You can't alter HTTP headers once any output has been sent.

As such, you need to move the code that might alter the headers (e.g. a call to [man]header/man) above any output.

petergi

thanks for the reply but can you help a little more because i am not even a newbie in php i began to learn 1 week ago. Can you rewrite me the above code correctly? i would appreciate it too much

petergi

and a question...why in #1 server plays well and #2 i get this warning?should i move to #1 server?

dagon

then server #1 has errors turned off, still an error is occurring your just not seeing it.

petergi

Can you rewrite me the above code correctly? i would appreciate it too much

dagon

try it yourself, you will learn more.

Imperialoutpost

bradgrafelman;10948807 wrote:
...you need to move the code that might alter the headers (e.g. a call to [man]header/man) above any output.

I've just had a quick look, but that should work in this case.

If that's not an option in future, take a look at buffering your output - ob_start and ob_end_flush.

petergi

ok thanks for your replies but i actually dont understand anything that you tell me.if it is do difficult and you cant give me the code above correctly then i am lost.

Imperialoutpost

You just need to understand what the error is telling you - you can't modify headers if the page already has content. In your script, by the time you modify the header your page already has:

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html><head><title>The test page! </title>
<META NAME="keywords" CONTENT="test page, test, page">
<META NAME="description" CONTENT="Test page">
<META NAME="ROBOTS" CONTENT="ALL">
</head>
<body>
<div>
<table width="339" border="0" align="left">
<tr>
<td width="333">Visitors :

What you need to do is move your php code to the top of the page, so that if the header changes it happens before the page output starts...

laserlight

Basically, instead of stuff like:

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html><head><title>The test page! </title>
<!-- ... -->
<?php
call_function_that_sends_header();
?>

You should structure your code such that the function is called before HTML output is written.

petergi

thank you i begin to understand 🙂