Try this:
/**
* Adding a "Copyright" field to the media uploader $form_fields array
*
* @param array $form_fields
* @param object $post
*
* @return array
*/
function add_copyright_field_to_media_uploader( $form_fields, $post ) {
$form_fields['copyright_field'] = array(
'label' => __('Copyright'),
'value' => get_post_meta( $post->ID, '_custom_copyright', true ),
'helps' => 'Set a copyright credit for the attachment'
);
return $form_fields;
}
add_filter( 'attachment_fields_to_edit', 'add_copyright_field_to_media_uploader', null, 2 );
/**
* Save our new "Copyright" field
*
* @param object $post
* @param object $attachment
*
* @return array
*/
function add_copyright_field_to_media_uploader_save( $post, $attachment ) {
if ( ! empty( $attachment['copyright_field'] ) )
update_post_meta( $post['ID'], '_custom_copyright', $attachment['copyright_field'] );
else
delete_post_meta( $post['ID'], '_custom_copyright' );
return $post;
}
add_filter( 'attachment_fields_to_save', 'add_copyright_field_to_media_uploader_save', null, 2 );
/**
* Display our new "Copyright" field
*
* @param int $attachment_id
*
* @return array
*/
function get_featured_image_copyright( $atts ) {
extract(shortcode_atts(array(
'id' => '',
), $atts));
$attachment_id = ( empty( $id ) ) ? get_post_thumbnail_id() : (int) $id;
if ( $attachment_id ){
$output = "<div class="img-wrapper">";
$output .= "<img src="".wp_get_attachment_url($attachment_id)."">";
$output .= "<span>".get_post_meta( $attachment_id, '_custom_copyright', true )."</span>";
$output .= "</div>";
return $output;
}
}
add_shortcode( 'show_img_with_copyright', 'get_featured_image_copyright' );
Then use Shortcode with attachment id anywhere in the articles like this:
[show_img_with_copyright id=63]
Tested and worked