static function upgrade() { Slickr_Flickr_Options::upgrade_options(); //save any new options on plugin update delete_option(self::ACTIVATE_KEY); //delete key so upgrade runs only on activation Slickr_Flickr_Cache::clear_cache(); //clear out the cache }
function clear_cache() { $_SERVER['REQUEST_URI'] = remove_query_arg('cache'); Slickr_Flickr_Cache::clear_cache(); $this->add_admin_notice(__('WordPress RSS cache', SLICKR_FLICKR_DOMAIN), __('has been cleared successfully', SLICKR_FLICKR_DOMAIN)); return true; }