Parse a string of HTML attributes and potentially inline styling declarations into a multidimensional associative array

I've got a string with HTML attributes:

$attribs = ' id= "header " class = "foo   bar" style ="background-color:#fff; color: red; "';

How to transform that string into an indexed array, like:

array(
  'id' => 'header',
  'class' => array('foo', 'bar'),
  'style' => array(
    'background-color' => '#fff',
    'color' => 'red'
  )
)

so I can use the PHP array_merge_recursive() function to merge 2 sets of HTML attributes.