Get image captions for images on gallery post format metabox

Question

I have a post format gallery. I have created a metabox to add my images:

function mytheme_show_post_gallery_metabox( $post ) {

wp_nonce_field( 'mytheme_post_gallery_metabox', '_mytheme_post_gallery_metabox' );
$gallery = get_post_meta( $post->ID, '_mytheme_post_gallery', true );

?>
<a class="gallery-add button media-button button-primary button-large media-button-select" href="#" data-uploader-title="<?php _e( 'Add gallery images', 'mytheme' ); ?>" data-uploader-button-text="<?php _e( 'Add gallery images', 'mytheme' ); ?>"><?php _e( 'Add gallery images', 'mytheme' ); ?></a>
<table>
  <tr>
    <td>
      <ul id="gallery-metabox-list">
        <?php if ( $gallery ) : ?>
          <?php foreach ( $gallery as $key => $value ) : $image = wp_get_attachment_image_src( $value ); ?>
            <li>
              <input type="hidden" name="_mytheme_post_gallery[<?php echo $key; ?>]" value="<?php echo $value; ?>">
              <img class="image-preview" src="<?php echo $image[0]; ?>">
              <a class="change-image" href="#"><?php _e( 'Change | ', 'mytheme' ); ?></a>
              <a class="remove-image" href="#"><?php _e( 'Remove', 'mytheme' ); ?></a>
            </li>
          <?php endforeach; ?>
        <?php endif; ?>
      </ul>
    </td>
  </tr>
</table>
<?php
}

This code allows me to add images to my gallery through a metabox. I am now trying to also get the caption for each image. I have been trying quite a few approaches but no luck so far.. Any ideas would be much appreciated.

Answer 1

Get the attachment ID and convert to a post. From there the caption is stored on the post object.

$thumb_img = get_post( get_post_thumbnail_id() ); // Get post by ID

echo $thumb_img->post_excerpt; // Display Caption

echo $thumb_img->post_content; // Display Description

In your loop it would look like:

<?php if($gallery) : ?>
    <?php foreach($gallery as $key => $value) :
        $image = wp_get_attachment_image_src($value);
        $image_post = get_post($value);
        $caption = $image_post->post_excerpt;

How you want to output the value depends on you and your css expectations;

<p class="wp-caption-text"><?php echo $caption; ?></p>

---

An alternate would be to use Caption_Shortcode:

[caption]<image> Caption[/caption]