title: How does the Opcache algorithm work?
body: <p>I've enabled OPcache on my server. It's a shared hosting server that serves ±30 websites. There are 2 high-traffic websites that use Symfony2. </p>
  
  <p>Is OPcache smart enough to cache to most of those high-traffic websites and not fill its cache with the other, not so important, websites?</p>
  
  <p>Or is it determined on first come, first serve?</p>