yii2 application应用绑定事件

<?php
use yii\web\Application;
defined('YII_DEBUG') or define('YII_DEBUG', true);
defined('YII_ENV') or define('YII_ENV', 'dev');

require(__DIR__ . '/../../vendor/autoload.php');
require(__DIR__ . '/../../vendor/yiisoft/yii2/Yii.php');
require(__DIR__ . '/../../common/config/bootstrap.php');
require(__DIR__ . '/../config/bootstrap.php');

$config = yii\helpers\ArrayHelper::merge(
    require(__DIR__ . '/../../common/config/main.php'),
    require(__DIR__ . '/../../common/config/main-local.php'),
    require(__DIR__ . '/../config/main.php'),
    require(__DIR__ . '/../config/main-local.php')
);


function xhprofStart($event){
    xhprof_enable();
}
//尾部
function xhprofEnd($event){
    $xhprof_data = xhprof_disable();
    $xhprof_root = '/mnt/www/mxhy/backend/web/';
    include_once $xhprof_root."xhprof_lib/utils/xhprof_lib.php";
    include_once $xhprof_root."xhprof_lib/utils/xhprof_runs.php";
    $xhprof_runs = new XHProfRuns_Default();
//    $route = $event->action->controller->route;
//    $route = str_replace('/','_',$route);
    $route = 'mxhy';
    $run_id = $xhprof_runs->save_run($xhprof_data, $route);
    echo '统计<br>';
    $domain = $_SERVER['SERVER_NAME'];
    $url = "http://".$domain."/xhprof_html/index.php?run=$run_id&source=$route";
    echo '<a target="_blank">'.$url.'</a>';
}

$application = new Application($config);
$application->on(Application::EVENT_BEFORE_REQUEST,'xhprofStart');
$application->on(Application::EVENT_AFTER_REQUEST,'xhprofEnd');
$application->run();