protected static function _clear_cache($category = false, $bCommon = false, $user_id = 0)
 {
     global $CACHE_MANAGER;
     self::$__USER_OPTIONS_CACHE = array();
     self::$__USER_OPTIONS_DB = array();
     self::$__USER_OPTIONS_MC = array();
     if ($category !== false) {
         if ($category !== 'admin_menu' && $category !== 'favorite') {
             if ($bCommon) {
                 $CACHE_MANAGER->cleanDir("user_option");
             } else {
                 $CACHE_MANAGER->clean("user_option:{$user_id}", "user_option");
             }
         }
     }
 }