ci CodeIgniter.php new $class()时报500错误

asdcqg

如题，ci版本是'2.2.6

asdcqg

/*
* ------------------------------------------------------
*  Instantiate the requested controller
* ------------------------------------------------------
*/
        // Mark a start point so we can benchmark the controller
        $BM->mark('controller_execution_time_( '.$class.' / '.$method.' )_start');
    echo $class;
    echo $method;

        $CI = new $class();
        echo 6666;
    die;
不输出 6666；在$CI = new $class();时报500