title: PHP Caching on Client or Server?
body: <p>I was reading about PHP Cache (APC, MemCache, etc), suddenly a question raised in my mind</p>
  
  <p><strong>The Caching in PHP is Done at which level?</strong></p>
  
  <ol>
  <li><p>Either it is done on Client side or Server side?</p></li>
  <li><p>Either on Hard Disk Space or Ram Space?</p></li>
  </ol>
  
  <p>Any additional details or information about it would be really helpful. </p>
  
  <p>Thanks in advance.</p>