/**
 +----------------------------------------------------------
 * Session 初始化
 +----------------------------------------------------------
 * @static
 * @access private
 +----------------------------------------------------------
 * @return boolean
 +----------------------------------------------------------
 */
 static function _init()
 {
     ini_set('session.auto_start', 0);
     if (is_null(Session::detectID())) {
         Session::id(uniqid(dechex(mt_rand())));
     }
     // 设置Session有效域名
     Session::setCookieDomain(C('COOKIE_DOMAIN'));
     //设置当前项目运行脚本作为Session本地名
     Session::localName(APP_NAME);
     Session::name(C('SESSION_NAME'));
     Session::path(C('SESSION_PATH'));
     Session::setCallback(C('SESSION_CALLBACK'));
 }