Someone

<?php
//
// SQL CONNECTION
//

$post_vars = array('messagetag' => 'message', 'usertag' => 'user', 'message' => 'messagetag', 'user' => 'usertag');

foreach($post_vars as $key => $value)
{
	$$key = strip_tags($value);
}

if($user == '')
{

}
elseif($message == '')
{

}
else
{
	// header call goes here, but NONE - no output before the header call can be sent.
}
?>