[PHP]Header error

Error:
Warning: Cannot modify header information - headers already sent by (output started at /home/codingso/public_html/root/includes/header.php:4) in /home/codingso/public_html/root/ipslogged.php on line 6

Warning: Cannot modify header information - headers already sent by (output started at /home/codingso/public_html/root/includes/header.php:4) in /home/codingso/public_html/root/ipslogged.php on line 7

Warning: Cannot modify header information - headers already sent by (output started at /home/codingso/public_html/root/includes/header.php:4) in /home/codingso/public_html/root/ipslogged.php on line 8

Warning: Cannot modify header information - headers already sent by (output started at /home/codingso/public_html/root/includes/header.php:4) in /home/codingso/public_html/root/ipslogged.php on line 9
PHP Code:

PHP Code:

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<?php
$dir="".$iplogfile;//2
if (isset($_REQUEST["download"])) {//3
    $file=$dir.$_REQUEST["file"];//4
    header("Content-type: application/force-download");//5
    header("Content-Transfer-Encoding: Binary");//6
    header("Content-length: ".filesize($file));//7
    header("Content-disposition: attachment; //8
filename=\"".basename($file)."\"");//9
    readfile("$file");//10

} 
 ?>

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Please help :(

PHP Code:

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Cannot modify header information - headers already sent by 


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Means that some HTML code/headers have been sent so you can't edit them or send more.

Quote:

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Originally Posted by Daney

PHP Code:

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Cannot modify header information - headers already sent by 


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Means that some HTML code/headers have been sent so you can't edit them or send more.

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I didn't send any headers :(
Maybe the host sends them automatically?

The code you posted is above the HTML(or !DOCTYPE) tag?
Is it included on some page? Frame?

Apparently, you include header.php, and you send data at line 4.

/home/codingso/public_html/root/includes/header.php:4

remove any white space.

maybe something after ?> or before <?

remember u can't run a header() when the output is already started

Quote:

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Originally Posted by Daevius

Apparently, you include header.php, and you send data at line 4.

/home/codingso/public_html/root/includes/header.php:4

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<?php include("includes/header.php");?> don't know if that counts

Quote:

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Originally Posted by EliteGM

The code you posted is above the HTML(or !DOCTYPE) tag?
Is it included on some page? Frame?

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No frames

Quote:

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Originally Posted by john_d

remove any white space.

maybe something after ?> or before <?

remember u can't run a header() when the output is already started

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What do you mean by when you say the output has already started?

what they mean by "output as already started" is that some HTML code has already been sent to the browser.

Quote:

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Originally Posted by Hidden

<?php include("includes/header.php");?> don't know if that counts

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Sure it does, can't have ANY output before header(), no html, no echos, nothing, only variables, queries.

<?php
header("Content-type: application/force-download");
header("Content-Transfer-Encoding: Binary");
header("Content-length: ".filesize($file));
header("Content-disposition: attachment; filename=\"".basename($file)."\"");?>
<?php include("includes/header.php");?>
<?php include_once("../config.php");?>
<?
$dir=$_REQUEST['filename'];
if (isset($_REQUEST["submit"])) {
$file=$dir.$_REQUEST["file"];

readfile("$file");
}
?>
<form action="">
FileName:<input type="text" name="filename" value="" />
<br />
<input type="submit" name="submit" value="Submit" />
<?php include("includes/footer.php");?>
Hmm..

What are you trying to do anyway?

Quote:

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Originally Posted by Foxx123

What are you trying to do anyway?

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Download the file that the person puts in the box, like.
Backing up 1 file since i don't know how to make a script that will back up everything.

Hmm.

If you want users to download something on your site that is not recognized by Apache as a runnable script (so, if it's not a .php file for instance) you can simply link the user to the file, and it will be downloading it. If you want to let users download something else, you'll have to set the headers to the appropriate mime-type and output (echo) the file content, as that is what the user will download.

<?php include("includes/header.php");?>

If header.php sends any HTML output you'll still be doomed. So fix it in header.php :). Whenever you echo something, it will be send right away to the client (though often it uses a buffer which gets filled before it's send). Before anything is send to the client, the client must receive the header data, that is...document type and things like that. So you may not have any HTML code being outputted before you want to set a header.

Try to use print(file_get_contents()); instead of readfile();