/**
* Saves data in a cache file.
*
* @param string $entryIdentifier An identifier for this specific cache entry
* @param string $data The data to be stored
* @param array $tags Tags to associate with this cache entry
* @param int $lifetime Lifetime of this cache entry in seconds. If NULL is specified, the default lifetime is used. "0" means unlimited liftime.
* @return void
* @throws Exception if no cache frontend has been set.
* @throws InvalidDataException if the data to be stored is not a string.
*/
public function set($entryIdentifier, $data, array $tags = array(), $lifetime = null)
{
parent::set($entryIdentifier, $data, $tags, $lifetime);
if ($lifetime === 0) {
// unlimited is not supported by nginx
$lifetime = 24 * 60 * 60;
}
header('X-Accel-Expires: ' . $lifetime);
}
