xmldoc

Hi all, I have simple code below : It run ok in one of my test server (Red Hat Enterprise) , PHP 4.3.2. However in the one of production server which have same OS and PHP version , the code did not display "done parsing xml" in log file. It just display "starting parsing xml" only. I have check all setting in php.ini , however cannot found any different between 2 server. Anybody have any ideas what happening here ? Thanks <?php

     $xmlfile = '/test/test.xml';
     $_logger->logdebug("starting parsing xml");
     $doc = xmldoc($xmlfile);

     $_logger->logdebug("done parsing xml");

?>