You cannot add an additional header. If you want two headers, and one already exists, first delete it with $client->__setSoapHeaders(NULL). Then issue $client->__setSoapHeaders($headers) where $headers is an array of soapHeader() objects.
You cannot add an additional header. If you want two headers, and one already exists, first delete it with $client->__setSoapHeaders(NULL). Then issue $client->__setSoapHeaders($headers) where $headers is an array of soapHeader() objects.