title: get the products collection filter by attributes with array of values
body: <p>i want to get the products collection filter by attributes with array of values in magento.</p>
  
  <p>eg:get collection of products whose color from array('red','blue','green') or brand from array('x','y','z').....</p>
  
  <p>note: the attribute filter will not be the intersection .I have mentioned <strong><em><code>OR</code></em></strong>.So it will be joined to form final products collection</p>