How do I resolve the "Cannot modify header information..." error?

harmony_wsc

My environment is:
PHP 5.2.5
Apache 2.2.8
W2k3
IIS 6.0

I am trying to run the following code to test a connection to a DB server. There are not spaces above or below the PHP tags.

<?php
include('adodb/adodb.inc.php');
echo 'hello world';

$dbora = ADONewConnection('oci8');
echo '<br>connection created<br>';
flush();
$dbora->Connect('XXX', 'hrs', 'XXX', 'SID');  //TNS:Connect timeout
echo '<br>connection established<br>';
flush();
?>

In this code I was getting a timeout error. I put the flush calls in so the error would display on the page right away. The flush tags are causing the following errors.

[06-Jun-2008 14:28:41] PHP Warning:  Cannot modify header information - headers already sent in Unknown on line 0
[06-Jun-2008 14:28:41] PHP Warning:  Cannot modify header information - headers already sent in Unknown on line 0

The errors are generated only in Apache. In IIS I do not get these errors. Does anyone know why?

Thanks

halojoy

how about this file:

adodb/adodb.inc.php
any spaces ... outside php tags?

harmony_wsc

I can comment out the include and the DB connect call and still get the error. But for fun, I looked at that file and there are no spaces or extra lines before or after the PHP tags.