在WordPress后台文章列表显示文章所用的附件数量

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add_filter('manage_posts_columns', 'posts_columns_attachment_count', 5);
add_action('manage_posts_custom_column', 'posts_custom_columns_attachment_count', 5, 2);
function posts_columns_attachment_count($defaults){
    $defaults['wps_post_attachments'] = __('Att');
    return $defaults;
}
function posts_custom_columns_attachment_count($column_name, $id){
        if($column_name === 'wps_post_attachments'){
        $attachments = get_children(array('post_parent'=>$id));
        $count = count($attachments);
        if($count !=0){echo $count;}
    }
}