white space before DOCTYPE tag if _SESSION variables exist

[nluis3294]

I've been tracking an issue, but I was wondering if anyone else has seen something like this.

My wordpress template has a DOCTYPE tag on the first line. When I have a $_SESSION variable declared, I automatically get 3 lines of white space before the DOCTYPE tag. If I wipe my session, the white space goes away.

I was able to track the problem down to this line:

\library\zend\session.php
approximately line 470
$startedCleanly = session_start();

Right before the session_start(), there is no white space. As soon as the function exits, I have 3 lines of white space.

I did a var_dump(debug_backtrace()), and it seems to arrive at this file/line through Vulnero. But I'm not sure how to track this any further.

This is the debug trace once i get into Bootstrap.
\library\Vulnero\Application\Bootstrap\Bootstrap.php (function=authenticate, approximate line number 386)
\library\Zend\Auth.php
\library\Zend\Auth\Storage\Session.php
\library\Zend\Session\Namespace.php

xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

//white space line here (goes away if there are no $_SESSION variables)
//white space line here (goes away if there are no $_SESSION variables)
//white space line here (goes away if there are no $_SESSION variables)