Proper method to use referral data for a PHP based website
<p>We manage an online enrollment site. Customers can ONLY enroll in our program if they come through an agent URL which currently has the format:</p>

<blockquote>
  <p>www.site.com?Agent=AGENTID</p>
</blockquote>

<p>While this approach works, it makes it very difficult for our agents to simply send out or 'tell' their URL to a potential customer. </p>

<p>I have tossed around the idea of making a subdomain redirect to the format above but our Media temple configuration requires major changes to the apache conf file which we are trying to avoid. </p>

<p>Similarly, I think we could just direct customers to www.site.com/agentid but run into the issue where /agentid will be treated as a page instead of an ID (and other times www.site.com/pagetitle may actually be used for a real page).</p>

<p>Anybody ever had a similar issue in the past? I'd be happy to hear any opinions for the best approach.</p>
