how to correctly invoke webservice

Hi! Sorry if this question is too basic, but I'm having trouble on invoking a webservice I'm running PEAR::SOAP on PHP 4.3.10 under Linux If I run the following code to invoke a webservice which returns a string it works fine: <? require_once 'SOAP/Client.php';

$wsdl    = new

SOAP_WSDL('http://www.mydomain.com/mywebservice.asmx?WSDL'); $client = $wsdl->getProxy(); $reply = $client->myFunction('someString','someOtherString'); ?> now, if I replace the strings passed to myFunction by variables, it stops working and I recieve SOAP errors I mean using this: <? require_once 'SOAP/Client.php';

$wsdl    = new

SOAP_WSDL('http://www.mydomain.com/mywebservice.asmx?WSDL'); $client = $wsdl->getProxy(); $string1 = 'someString'; $string2 = 'someOtherString'; $reply = $client->myFunction(string1 ,string2); ?> There's very little info on this module on internet... what am I doing wrong?? Thanks in advance, Juan