title: PHP Code Caching & Optimization
body: <p>I am from Java EE background and learning PHP, so please advise me accordingly.</p>
  
  <p>Does PHP tries to interpret the code every time it is requested? Or is there any modificationTestInterval of JSP? I am using PHP 5.4 with httpd on CentOS 5. It has Zend included. Does it do opcode caching automatically?</p>
  
  <p>Please suggest optimization techniques if my code is not going to change frequently. </p>