uncaught soap exception inside try catch

hi all i'm having an issue with some soap code i'm trying to run it keeps coming back with uncaught soap exception even though i have it running inside a try catch block [php] $sc = new SoapClient($strWsdlUrl);

        try {
            $strID = $sc->getId($strTempSessionID);
        }
        catch (SoapFault $strException) {
            print 'failed';
            exit;
        }

[/php] when i run the script from the command line without the $strTempSessionID variable it does catch the exception but when i run the script from a web browser without the $strTempSessionID variable it says uncaught exception i have tried catching with Exception, I have tried both individually as well as together sorry, exceptions never were my strong point can anyone help me out? thanks dave