My CSS file is acutally a PHP file which is served with content-type text/css
so that I can use PHP variables in that file. style.php
looks like this:
<?php
header('Content-Type: text/css');
$bgColor = '#000';
?>
body { background:<?php print $bgColor; ?>; }
It works as expected, but I am a bit worried if the browser caches the dynamically created css file.
When looking at the requests in firebug, it seems to me that the browser is loading style.php
anew everytime I reload the page.
I already tried to add these cache headers:
header('Cache-control: must-revalidate');
header('Expires: ' . gmdate('D, d M Y H:i:s', time() + 60 * 60 * 24) . ' GMT');
But no luck. The file is still loaded everytime the page is loaded. What are the appropriate headers in order to force the browser to cache the file for a certain amount of time?