186795 http request with XML

We are provided an interface to check the traffic on our web servers by our service provider. This interface can be accessed by a http request that sends out XML. To be verified it needs to have a PGP signature included and the respective public key stored at the service provider. We need a PHP script that sends an XML request over http to a sever on a specified port and parses the answer (XML response) and sends the detail of the response to an E-Mail address.