Include Attachments in WordPress Search Results

wordpress-attachments-search

function my_attachments_search( $query ) {
 if ( !is_search() ) 
    return $query; 		
 
  $post_types = $query->get( 'post_type' );
  if ( ! $post_types || 'post' == $post_types )
    $post_types = array( 'post', 'attachment' );
 
  if ( is_array( $post_types ) ) 
    $post_types[] = 'attachment';
 
  $query->set( 'post_type', $post_types );
  return $query;
}
// hook our function to the filter
add_filter( 'pre_get_posts', 'my_attachments_search' );