Yii - 不显示图像文件

I have img tag in my view file like the below.

<img src="<?php echo Yii::app()->baseUrl.'/img/test.jpg'; ?>" />

But, it doesn't show the image.

I have "img" folder on the same directory where index.php(front controller)exists.

What's wrong!?

Anybody knows how to solve my problem?

Thanks in advance!!!

+++Added 1+++

I'm developing in local environment.

+++Added 2+++

Very weird thing is happening.

When I access the one specific image by typing the path to the image on browser, the requested image is displayed.

http://localhostname/img/sidebar.gif

But when I access the other images in the same img foloder, I get "Forbidden" error.

Also, when I type the below in my view, it shows the image.

<img src="<?php echo Yii::app()->baseUrl.'/img/sidebar.jpg'; ?>" />

But, when I type the path to the other images that exists in the same img directory, it doesn't show any images.

Instead of Yii::app()->baseUrl

Try this: Yii::app()->getBaseUrl(true)

By default, baseUrl returns relative URL.

<img src="<?= Yii::app()->getBaseUrl(true) ?>/img/sidebar.jpg" />

If images not show, the debug browser have error 404. See there. You will see full url that should get. It url not the one you expect - "<?php echo Yii::app()->baseUrl.'/img/test.jpg'; ?>". You should edit you code in conformity with this error.