Soap - how to check that wsdl exists

[cretaceous]

not sure how to do this..

I have a wsdl service accessed via SOAP but the wsdl goes offline from time to time

so the url remains valid but the wsdl is not there

how do I check the wsdl exists?
I just get soap errors right now

$nsclient = new SoapClient($wsdl);

edit:

I tried this:

	try
	  {
	$nsclient = new SoapClient($wsdl,array('exceptions' => TRUE));
	}
	catch (SoapFault $e)
	  {
	 $return_value ='service not available';
	  }

but I still get uncaught SOAP errors
thanks!

[halojoy]

I dont think this will solve,
but they use this for error catching

try{

} catch (SoapFault $soapFault) {
    exit($soapFault);
}

or an echo

try{

} catch (SoapFault $soapFault) {
    echo $soapFault;
}