yii\base\ErrorHandler::handleException PHP Method

    public function handleException($exception)
    {
        if ($exception instanceof ExitException) {
            return;
        }
        $this->exception = $exception;
        // disable error capturing to avoid recursive errors while handling exceptions
        $this->unregister();
        // set preventive HTTP status code to 500 in case error handling somehow fails and headers are sent
        // HTTP exceptions will override this value in renderException()
        if (PHP_SAPI !== 'cli') {
            http_response_code(500);
        }
        try {
            $this->logException($exception);
            if ($this->discardExistingOutput) {
                $this->clearOutput();
            }
            $this->renderException($exception);
            if (!YII_ENV_TEST) {
                \Yii::getLogger()->flush(true);
                if (defined('HHVM_VERSION')) {
                    flush();
                }
                exit(1);
            }
        } catch (\Exception $e) {
            // an other exception could be thrown while displaying the exception
            $this->handleFallbackExceptionMessage($e, $exception);
        } catch (\Throwable $e) {
            // additional check for \Throwable introduced in PHP 7
            $this->handleFallbackExceptionMessage($e, $exception);
        }
        $this->exception = null;
    }