web_service.php

<?php
function sendEmailViaWebService($email) {
    $soapClient = new soapclient("http://www.paulinia.sp.gov.br/email/sendmail.asmx?WSDL", "wsdl");
    
    $request = "<Send xmlns='http://tempuri.org/'>
                  <De>{$email['from']}</De>
                  <Para>{$email['to']}</Para>
                  <Assunto>{$email['subject']}</Assunto>
                  <Mensagem>{$email['message']}</Mensagem>
                </Send>";
    
    return $soapclient->call("Send", array($request));
}

sendEmailViaWebService(array("from" => "lol@wut.com", 
                             "to" => "wut@lol.com", 
                             "subject" => "Teste", 
                             "message" => "rofling"));