title: Laravel 5 - get MIME type from file extension
body: <p>In Laravel 5 how can I get MIME type from extension? Even better if there's a way to convert array of extensions to array of mimes.</p>
  
  <p>E.g. how to convert <code>array('doc', 'xls')</code> to <code>array('application/msword', 'application/vnd.ms-excel')</code>?</p>