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 if ( has_post_thumbnail()) {
   $large_image_url = wp_get_attachment_image_src( get_post_thumbnail_id(), 'large');
   echo '<a href="' . $large_image_url[0] . '" >';
   echo '</a>';

This code adds a big image to the thumbnail image. What can I do add title to 'large' image?

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I add this code title="' . the_title_attribute('echo=0') . '" but it is add title page, i need title thumbnail image. – Евгений Березовский May 28 '13 at 19:47
What 'title' are you trying to add? The image's title? – Pat J May 28 '13 at 20:26
Yes it is, Pat, i try add title of image... – Евгений Березовский May 30 '13 at 6:23

Check the Codex. the_post_thumbnail accepts two parameters, the second of which is $attr-- "attributes".

the_post_thumbnail('full',array('title'=>'yay! a title!'));

The Codex entry for the_post_thumbnail is not clear on what is and is not allowed as an "attribute" but it appears to depend on wp_get_attachment_image and by filters applied by that function. title does work though. I checked.

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Not sure if you mean title attribute or title as in caption. The code below would echo the image title as a caption.

EDIT - up-voted @s_ha_dum's answer as it looks like you were looking for the title attribute.

EDIT - `wp_get_attachment_image_src' returns an array with the image URL in the first position.

if ( has_post_thumbnail()) {
   $your_thumb_id = get_post_thumbnail_id();
   $args = array(
     'post_type' => 'attachment',
     'numberposts' => 1,
     'post_status' => null,
     'p' => $your_thumb_id

   $attachments = get_posts( $args );
   if ( $attachments ) {
      foreach ( $attachments as $attachment ) {
         $large_src = wp_get_attachment_image_src( $attachment->ID, 'large' );
         echo '<a href="' . $large_src[0] . '">';
         echo wp_get_attachment_image($attachment->ID,'medium');
         echo '</a>';
         echo '<p>';
         echo apply_filters( 'the_title', $attachment->post_title );
         echo '</p>';
} ?>
share|improve this answer
Missing a ; on about line 3. – Pat J May 28 '13 at 20:43
Thanks @PatJ. Edited – sprclldr May 28 '13 at 20:46
This code adds a link to the thumbnail - "www.mydomen/Array" ?Now the thumbnail does not appear in the lightbox, just running this link - "www.mydomen/Array"... – Евгений Березовский May 30 '13 at 6:33
Don't know why wp_get_image_src returns an array, but I've edited the code to reflect that. I should be returning the source correctly now. – sprclldr Jun 3 '13 at 18:56

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