Используйте встроенный класс PHP SoapClient:
$client = new SoapClient("some.wsdl");
// To call an Add method on the .NET-based service, that takes 2 parameters:
$arguments->a = 1;
$arguments->b = 2;
$result = $client->Add( $arguments );
echo( "1 + 2 = " . $result->AddResult );