/**
* Sets the caching (Cache-Control & Expires) with a cache age of $lastModified
* or if $lastModified === false, sets Pragma: no-cache & Cache-Control: no-cache
*/
protected function setCachingHeaders($lastModified = false)
{
$maxAge = $this->context->getIgnoreCache() ? false : $this->context->getRefreshInterval();
if ($maxAge) {
if ($lastModified) {
header("Last-Modified: {$lastModified}");
}
// time() is a kernel call, so lets avoid it and use the request time instead
$time = $_SERVER['REQUEST_TIME'];
$expires = $maxAge !== false ? $time + $maxAge : $time - 3000;
$public = $maxAge ? 'public' : 'private';
$maxAge = $maxAge === false ? '0' : $maxAge;
header("Cache-Control: {$public}; max-age={$maxAge}", true);
header("Expires: " . gmdate("D, d M Y H:i:s", $expires) . " GMT", true);
} else {
header("Cache-Control: no-cache", true);
header("Pragma: no-cache", true);
}
}
