Remove unwanted lines while Content-Type: text/plain

Question

I will describe my problem with code - it would be the best.

<?
include('configs.php');  
require_once 'DBQueries.php'; 
$con = mysql_connect( $db_host, $db_user, $db_pass );
mysql_query("SET NAMES 'cp1250'") or die('Could not set names');     
if (!$con)
  {
  die('Could not connect: ' . mysql_error());
  } 
mysql_select_db($db_dbname);     
$oUnexportedOrders = DBQueries::getInstance()->getUnexportedOrders();
header("Content-Type: text/plain");         
while ($aOrderExport = mysql_fetch_assoc ($oUnexportedOrders)){
    echo $aOrderExport['data'];  
}

What is happening:

1. include some stuff
2. connection to DB
3. get data from DB
4. IMPORTANT: set header as Content-Type: text/plain
5. IMPORTANT: print text data with echo

Result:

**!!! There are 7 unwanted lines !!!**
line of data
line of data 
line of data
line of data
....

Expected result:

line of data
line of data 
line of data
line of data

- Expected is lines of data generated by echo inside the for, but without that 7 lines.

QUESTION:

How to do that, what to call when (etc.) to get rid of those unwanted lines?

Thank you.

Answer 1

ob_clean(); will clear out the output buffer, in conjuction with ob_start();

<?
ob_start();
include('configs.php');  
require_once 'DBQueries.php'; 
$con = mysql_connect( $db_host, $db_user, $db_pass );
mysql_query("SET NAMES 'cp1250'") or die('Could not set names');     
if (!$con)
  {
  die('Could not connect: ' . mysql_error());
  } 
mysql_select_db($db_dbname);     
$oUnexportedOrders = DBQueries::getInstance()->getUnexportedOrders();
ob_clean();
header("Content-Type: text/plain");         
while ($aOrderExport = mysql_fetch_assoc ($oUnexportedOrders)){
    echo $aOrderExport['data'];  
}

That should get rid of any unwanted extra whitespace from included files.

Answer 2

The blank lines don't come from the mysterious unknown. They're in your code somewhere. Check your files (including the files you include/require) for whitespace before your opening PHP tags and after your closing PHP tags. That whitespace will be passed to the browser.