how to enable cache in php server api code example

Example 1: cache for php website

# Checks if the file is physically NOT present
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^([a-z0-9-]+)+/([a-z0-9-]+)\.html$	/controller.php?partA=$1&partB=$2 [L]

Example 2: How to prevent Browser cache for php site

Here, if you want to control it through HTML: do like below Option 1:

<meta http-equiv="expires" content="Sun, 01 Jan 2014 00:00:00 GMT"/>
<meta http-equiv="pragma" content="no-cache" />
  
And if you want to control it through PHP: do it like below Option 2:

header('Expires: Sun, 01 Jan 2014 00:00:00 GMT');
header('Cache-Control: no-store, no-cache, must-revalidate');
header('Cache-Control: post-check=0, pre-check=0', FALSE);
header('Pragma: no-cache');

AND Option 2 IS ALWAYS BETTER in order to avoid proxy based caching issue.