How to get the image attachement custom link with PHP – WordPress

3 comments

1. As yoavmatchulsky wrote, this field is dynamically filed by ~wp-includes/js/media-views.js after you manually choose an image
   but if you have an id of attachment, use wp_get_attachment_link( $id, $size);
   as size use ‘full’
   full ref. in codex

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2. Or, if you are trying to use a custom link, the method described here might help.

   Basically, in your functions.php, you could add a code similar to this:

   // Adds a custom url field to your attachment
   function attachment_custom_url( $form_fields, $post ) {
           $form_fields['video-url'] = array(
           'label' => 'CustomURL',
           'input' => 'text',
           'value' => get_post_meta( $post->ID, 'custom_url', true ),
           'helps' => 'Add custom URL, if applicable',
       );
       return $form_fields;
   }
   add_filter( 'attachment_fields_to_edit', 'attachment_custom_url', 10, 2 );
   
   function attachment_custom_url_save( $post, $attachment ) {
   if( isset( $attachment['custom-url'] ) )
   update_post_meta( $post['ID'], 'custom_url', esc_url( $attachment['custom-url'] ) );                        
       return $post;
   }
   add_filter( 'attachment_fields_to_save', 'attachment_custom_url_save', 10, 2 );
   

   And then, you could call it in your php like so:

   <?php 
   <a href="'.get_post_meta($post->ID, 'custom_url', true).'">Custom Link</a>;
   ?>
   

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3. I know this is an old thread, but I solve this by getting the post meta of the attachment, which was easier to me.

   In my installation, custom URL input is shown like this:

   <input type="text" class="text" id="attachments-140443-foogallery_custom_url" name="attachments[140443][foogallery_custom_url]" value="https://mycustomurl.com">
   

   So, I assumed that if the first brackets contains the post ID, the second one is a meta key to save this value on wp_postmeta table. And there it was, just starting with the underscore character so it would be a hidden meta data. Therefore, the easier way to get this value is like this:

   get_post_meta( get_post_thumbnail_id( get_the_ID() ), '_foogallery_custom_url', true);
   

   Of course you need to check if the post does have a thumbnail, but that’s easy to adapt.

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