setAttribute does not work without an array as value

[frazehmad]

On home page of this repo, I see an example of setting an attribute:

$tag->setAttribute('class', 'foo');

But above code does not work and through below error:

Illegal string offset 'value'

But If I use an array for second parameter then it works fine:

$tag->setAttribute('class', array('value'=>'foo', 'doubleQuote'=>true));

[paquettg]

I'll take a look at it.