title: PHP: working with external cookies
body: <p>I have a php application that pulls in pages from a separate domain via iframes. These pages are using cookies.</p>
  
  <p>I've noticed some browsers have a default set that blocks any external cookies. This is going to cause quite a problem for me. </p>
  
  <p>I've heard mention of P3P but can't find much mention about how to implement it with cookies.</p>
  
  <p>Any help most appreciated,</p>
  
  <p>Jonesy</p>