Writing SMTP-Based SOAP Messages in PHP

Listing 5: Retrieving messages via the POP3 protocol

<?php
/* include the email server class, which knows how to
   parse a standard email as a SOAP message */
require_once 'SOAP/Server/Email.php';
/* create the SOAP server object */
$server = new SOAP_Server_Email('smtp.domain.com');


/* This is our image archival class.  It is
   extremely simplistic; it just stores the image
   to a configured directory, then returns
   an http url pointing to the image. */
class imageArchiver
{
    /* configure variables */
    var $basedir = 'c:\\website\\images\\';
    var $baseurl = 'http://server.com/images/';
    /* SOAP related variables */
    var $method_namespace = 'http://server.com/imagearchive';
    function archiveImage($name, $image)
    {
        $f = fopen($this->basedir.$name, 'w');
        if ($f) {
          fwrite($f, $image);
          fclose($f);
          return $this->baseurl.$name;
        }
        // we were unable to open the file, return an error
        return new SOAP_Fault("Unable to save image $name to disk");
    }
}

/* Now we register our image archive class to the SOAP server. */
/*The SOAP  server can only execute functions that are registered with it. */
$server->addObjectMap(new imageArchiver());
/* include a class to access POP3 */
require_once 'Net/POP3.php';

/* connect to a POP3 server and read the messages */
$pop3 =& new Net_POP3();
if ($pop3->connect('localhost', 110)) {
    if ($pop3->login('soap', 'password')) {
        $listing = $pop3->getListing();
        /* now loop through each message, and call the 
           SOAP server with that message */
        foreach ($listing as $msg) {
            $email = $pop3->getMsg($msg['msg_id']);
            /* This is where we actually handle the SOAP
               response.  The SOAP::Server::Email class we
               are using will send the SOAP response to 
               the sender via email. */
            if ($email) {
                $server->service($email);
                $pop3->deleteMsg($msg['msg_id']);
            }
        }
    }
    $pop3->disconnect();
}
?>