Collects, sanitizes, and renders HTML attributes.
To use, optionally pass in an associative array of defined attributes, or add attributes using array syntax. For example:
$attributes = new Attribute(array('id' => 'socks'));
$attributes['class'] = array('black-cat', 'white-cat');
$attributes['class'][] = 'black-white-cat';
echo '<cat' . $attributes . '>';
// Produces <cat id="socks" class="black-cat white-cat black-white-cat">
$attributes always prints out all the attribut