WordPress 媒体文件添加重新关联附加选项的方法

WordPress 允许您将一个媒体文件关联附加到一篇文章，但默认不能修改关联，本教程将添加一个可以修改媒体文件关联附加的选项。
将下面代码添加到当前主题的 functions.php 文件:
add_filter("manage_upload_columns", 'upload_columns');
add_action("manage_media_custom_column", 'media_custom_columns', 0, 2);
   
function upload_columns($columns) {
    unset($columns['parent']);
    $columns['better_parent'] = "Parent";
    return $columns;
}
function media_custom_columns($column_name, $id) {
    $post = get_post($id);
    if($column_name != 'better_parent')
        return;
        if ( $post->post_parent > 0 ) {
            if ( get_post($post->post_parent) ) {
                $title =_draft_or_post_title($post->post_parent);
            }
            ?>
            <strong><a href="<?php echo get_edit_post_link(
$post->post_parent ); ?>"><?php echo $title
?></a></strong>, <?php echo get_the_time(__('Y/m/d'));
?>
            <br />
            <a
onclick="findPosts.open('media[]','<?php echo $post->ID
?>');return false;" href="#the-list"><?php _e('Re-Attach');
?></a>
            <?php
        } else {
            ?>
            <?php _e('(Unattached)'); ?><br />
            <a
onclick="findPosts.open('media[]','<?php echo $post->ID
?>');return false;" href="#the-list"><?php _e('Attach');
?></a>
            <?php
        }
}