title: Browser Cache Control System in Php
body: <p>i'm trying to build a browser cache control system written in PHP.</p>
  
  <p>More in the deep, i'd like to serve every browser request with Php, to generate the right HTTP Response Header an to generate an <em><strong>HTTP 200</strong></em> or an <em><strong>HTTP 304 Not Modified</strong></em> at the right time. </p>
  
  <p>The big question is: how can i delegate PHP to check if a resources is an HTTP 200 or an HTTP 304 ? </p>