Headers Already Sent Error

[mdj]

Hi Guys,

Im getting the headers already sent error.

I've looked through the forum for ideas and removed all the blank lines in the scripts but im still getting the errors.

Here is the scripts that are giving me the errors.

The end of the first script re-directs to the second using the Location command.

		// Register some session variables!
		session_register('username');
		session_register('first_name');
		session_register('surname');
		session_register('email');
		session_register('userlevel');	
		mysql_query("UPDATE customers SET last_login=now() WHERE username='$username'");
		header("Location: login_success.php");

This then displays this page

<? 
session_start(); 
echo "Welcome". $HTTP_SESSION_VARS['first_name']." ".$HTTP_SESSION_VARS['surname'].", you have successfully logged in";
echo "<br /><a href=logout.php>Logout</a><br>
<a href=user_account_info.php>View / Update Account Info</a>";
?> 

If you select the Update Accounts link it displays the page correctly but i get the Warning: Cannot send session cache limiter - headers already sent (output started.... Error

This is the top of the script that generates the error.

<?php require_once('Connections/smslist.php'); ?> 
<?php
session_start(); // *** Restrict Access To Page: Grant or deny access to this page
$FF_authorizedUsers="";
$FF_authFailedURL="login.htm";
$FF_grantAccess=0;

if (isset($HTTP_SESSION_VARS["username"])) {
  if (false || !(isset($HTTP_SESSION_VARS["MM_UserAuthorization"])) || $HTTP_SESSION_VARS["MM_UserAuthorization"]=="" || strpos($FF_authorizedUsers, $HTTP_SESSION_VARS["MM_UserAuthorization"])) {
    $FF_grantAccess = 1;

Any ideas what is causing this???

[feldon23]

first 2 lines of your PHP file must be:

<?php
ob_start();

Then after your header:location thingy,

ob_end_flush();

[zalath]

Don't really have to be - the error is caused by output to the browser. Even a single whitespace before the starting <? will cause that. Output buffering is not required.

[mdj]

Thanks Guys,

I never knew PHP could be so picky!

I had deleted all the blank lines but there were 2 blank SPACES at the end of this line

<?php require_once('Connections/smslist.php'); ?> 

removed them, now it works. The strange thing is, that this line was created by dreamweaver!!

[jerdo]

That's because DreamWeaver is not a php editor, they half ass included the php stuff. Also DreamWeaver will always put in extra html tags and spaces if you don't go through the menu and use it's built in functions for removing them.

[mdj]

Yeah. so i noticed!!