Warning: Cannot modify header information ?

Zrob

:glare: Well I have been searching for help on the error message and I am still having trouble with it:
Warning: Cannot modify header information - headers already sent by (output started at........Forum/includes/sessions.phpI checked for white spaces and blank lines but not sure what else to do. I am trying to fetch data from my forum to my index home page.php and I am just using the basic examples that I found and its working but I get this header error. Bellow is the php code I am trying out, and its embedded into my page, any help is appreciated!

<?php
$phpbb_root_path = './Forum/'; // test was ../../../
define ('IN_PHPBB', true);
include_once ($phpbb_root_path . 'extension.inc'); // always need on all scrips
include_once ($phpbb_root_path . 'common.' . $phpEx); // always need on all scrips
include_once ($phpbb_root_path . 'includes/bbcode.' . $phpEx); // always need on all scrips
include_once ($phpbb_root_path . 'mods/phpbb_fetch_all/common.' . $phpEx); // commons is shared code
include_once ($phpbb_root_path . 'mods/phpbb_fetch_all/posts.' . $phpEx); // this one depends on your goal
$userdata = session_pagestart($user_ip, PAGE_INDEX);
init_userprefs($userdata);
$news = phpbb_fetch_posts();
phpbb_disconnect();
?>
<ul>
<?php for ($i = 0; $i < count($news); $i++) { ?>
<li><?php echo $news[$i]['topic_title'];?></li>
<?php } ?>
</ul>

Thanks

NogDog

It would be easier to debug if you showed us the complete error message, as it lists the line number and filename where output was started. Then we need to see that file, or at least all of it up to that line (and maybe a few lines past it).

Zrob

NogDog wrote:
It would be easier to debug if you showed us the complete error message, as it lists the line number and filename where output was started. Then we need to see that file, or at least all of it up to that line (and maybe a few lines past it).

Right, here it is all of it:

Warning: Cannot modify header information - headers already sent by (output started at /usr/home/**/public_html/index.php:10) in /usr/home/**/public_html/Forum/includes/sessions.php on line 254 and the same again on line 255

NogDog

And what does /usr/home/*****/public_html/index.php look like (at least the first dozen lines, since the error message says output started at line 10 in it)?

Zrob

NogDog wrote:
And what does /usr/home/*****/public_html/index.php look like (at least the first dozen lines, since the error message says output started at line 10 in it)?

Here it is:

<html>
<head>
<title>Chrome CSS Drop Down Menu</title>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />

<link rel="stylesheet" type="text/css" href="Robs77.css" /> <!--bg colors, text and font size types and colors-->
<link rel="stylesheet" type="text/css" href="chromestyle9.css" />
</head>
<script type="text/javascript" src="chrome.js">
/***********************************************
* Chrome CSS Drop Down Menu- © Dynamic Drive DHTML code library (www.dynamicdrive.com)
* This notice MUST stay intact for legal use
* Visit Dynamic Drive at http://www.dynamicdrive.com/ for full source code
***********************************************/
<script type="text/javascript" src="chrome.js">
</script>
<body>

NogDog

As the expression goes, "Well there's your problem." Any content not within <?php . . . ?> tags is going to cause headers to be sent (unless you turn on output buffering, first).

Presumably the error is occurring in your sessions.php file when it calls the session_start() function, but that comes after the index.php script starts, so headers have already been sent.

Yari

Zrob, as NogDog says, your 'sessions.php' file is being included further on down the page, after your website has already started writing out HTML... causing the error.

Find where the sessions.php file is included on your page and either move it to the top of your page (before any HTML), or check why some HTML code is being called before the sessions file.

Zrob

NogDog wrote:
As the expression goes, "Well there's your problem." Any content not within <?php . . . ?> tags is going to cause headers to be sent (unless you turn on output buffering, first).

Presumably the error is occurring in your sessions.php file when it calls the session_start() function, but that comes after the index.php script starts, so headers have already been sent.

Seems like a tough road ahead trying to learn this stuff, I will have to do some serious reading about headers and PHP code 😃

I thought you could run php inside html but I guess this is a different application, I tried putting php tags up top still no go.....:glare:

thanks for the tip!

Yari wrote:
Zrob, as NogDog says, your 'sessions.php' file is being included further on down the page, after your website has already started writing out HTML... causing the error.

Find where the sessions.php file is included on your page and either move it to the top of your page (before any HTML), or check why some HTML code is being called before the sessions file.

Well my sessions.php file is in the Forum folder on my server, and the PHP scrips calls in data from these folders.

NogDog

You can run PHP within HTML. But you need to be cognizant of the fact that once anything is sent to the browser (which includes HTML text not within <?php tags), headers are sent at that point, as the headers must be sent before the content is. Therefore, any PHP functions called later in the script which attempt to create or alter HTTP headers will not work.

The options are (1) reorganize your script so that anything that affects HTTP headers (e.g.: session_start(), setcookie(), header(), etc.) are executed before any output is sent, or (2) use output buffering by sticking the following at the very beginning of the main script (with nothing before it, including blank lines or spaces):

<?php
ob_start();
?>