Thanks for your replay..
i got the some php source from http://sourceforge.net/projects/nusoap/ this link..
nusoap.php is the file while supports all soap funtionalities it seems...
when i tried with one of the ASP.NET webservice .asmx file , it is connecting to the webservice and its not returning any value..
then i've used the $client->getError() function to get the error.. then it always shows this error
wsdl error: phpType is struct, but value is not an array: see debug output for details
But i don't know exactly where would be the problem..
if u come accross this issue plz let me know...