* [Hosting environments like WPEngine don't permit (extra) .php files located in the webroot (apparently)](https://civicrm.stackexchange.com/questions/15942/is-it-possible-in-civicrm-to-change-extension-of-cached-php-files-from-php-to-s) * Caching generated content there means potential for info leakage or execution via input variables * Filesystem caching can be inefficient compared to other caches * Herb has done work to get Smarty caching via Redis? * https://www.drupal.org/node/2570335 * https://forum.civicrm.org/index.php?topic=35125.0;nowap * https://issues.civicrm.org/jira/browse/CRM-17401 * https://github.com/freeform/civicrm-drupal-pantheon/blob/4.6.x/patches/smarty-redis-civi-cache.patch * would Smarty 2 choke if we just set the path to redis:// ? * .php extension is [tacked on here](https://github.com/civicrm/civicrm-packages/blob/master/Smarty/Smarty.class.php#L1512), may be other places to change this