Title- Tag für Beitragsbild

//to add the image title to the 'featured image' output // alchymyth 2013 //
add_filter('post_thumbnail_html','add_post_thumbnail_title_attribute',10,3);
function add_post_thumbnail_title_attribute($html, $post_id, $post_thumbnail_id) {   
 
if( $html == '' ) {
 return $html;
} else {
 $out = $html;
  $thumbnail_image = get_posts(array('p' => $post_thumbnail_id, 'post_type' => 'attachment'));
  if ($thumbnail_image && isset($thumbnail_image[0])) {
  
   $title = $thumbnail_image[0]->post_title;
 if($title) {
  $output = ' title="' . esc_attr($title) . '" ';
  $out = str_replace( 'class=', $output . 'class=', $html );
  } 
  }
}
return $out; 
}