Description:
------------
This is related to bug 31045 which I just reported, but it's a slightly different scenario and result here.  If I compare the result of simplexml_load_string in an 'if' statement, I'm getting a segmentation fault.  The same thing happens on simplexml_load_file.

Reproduce code:
---------------
<?php
if (($doc = simplexml_load_string('<xml></xml>')) == false)
{
	echo 'equals false';
}
else
{
	echo 'does not equal false';
}
?>


Expected result:
----------------
does not equal false

Actual result:
--------------
Segmentation fault