如何从CakePHP中的HTMLHelper向使用image方法创建的链接添加属性？

I'm using CakePHP.

This line of code will generate a <img> tag:

$html->image('image.png', array('alt', 'Alternative text'));

And this will generate the same thing, but it will make the image clickable:

$html->image('image.png', array('alt' => 'Alternative text', 'url' => 'http://www.example.com'));

So far I understand, but what can I do if I want to add attributes to the <a> tag.

Doing this:

$html->image('image.png', array('alt' => 'Alternative text', 'url' => 'http://www.example.com/', 'class' => 'aClass'));

Will add the attribute to <img> instead of <a>. The output is something like this:

<a href="http://www.example.com/">
    <img src="image.png" alt="Alternative text" class="aClass" />
</a>

But I want something like this:

<a href="http://www.example.com/" class="aClasse">
    <img src="image.png" alt="Alternative text" />
</a>

I tried to do like a $html->link() using a $html->image() as the first parameter but it didn't work.

Any idea?