尝试以下操作：
/**
* 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\' );
然后在文章中的任何地方使用带有附件id的快捷码，如下所示：
[show_img_with_copyright id=63]
测试和工作
