I am trying to use a PHP include in my called function to store my DB connection variables.   When I uncomment the include below and comment out the variables, my code does not work.   I successfully use this  PHP include in many other places, but only when called from XAJAX does this not work.   This is a complete mystery to me.  Thanks in advance for any of your suggestions.   

<?PHP

require_once("./xajax/xajax_core/xajax.inc.php");

function process_form_data($form_data, $menu_update, $new_menu, $button)
{

$host = "xxxx";
$dbuser = "xxxx";
$dbpassword = "xxxx";
$dbname = "xxx";

/*include( "DBinfo.inc");*/