您好，我有一个页面，上面有一个小上载程序，可以在库中上载媒体，下面是我的代码：

            <?php 
                $post_id = $post->ID;
                if ( isset( $_POST[\'html-upload\'] ) && !empty( $_FILES ) ) {
                    require_once(ABSPATH . \'wp-admin/includes/admin.php\');
                    $id = media_handle_upload(\'async-upload\', $post_id); //post id of Client Files page
                    unset($_FILES);
                    if ( is_wp_error($id) ) {
                        $errors[\'upload_error\'] = $id;
                        $id = false;
                    }

                    if ($errors) {
                        echo "<p>There was an error uploading your file.</p>";
                    } else {
                        echo "<p>Your file has been uploaded.</p>";
                    }
                }

            ?>

使用我的表格：

<form id="file-form" enctype="multipart/form-data" action="<?php echo $_SERVER[\'REQUEST_URI\']; ?>" method="POST">

<p id="async-upload-wrap"><label for="async-upload">upload</label>
<input type="file" id="async-upload" name="async-upload"> <input type="submit" value="Upload" name="html-upload"></p>

<p><input type="hidden" name="post_id" id="post_id" value="<?php echo $post_id ?>" />
<?php wp_nonce_field(\'client-file-upload\'); ?>
<input type="hidden" name="redirect_to" value="<?php echo $_SERVER[\'REQUEST_URI\']; ?>" /></p>
<p><input type="submit" value="Save all changes" name="save" style="display: none;"></p>
<form>  

和我的代码段，以启用媒体分类和标记：

// add categories for attachments
function add_categories_for_attachments() {
    register_taxonomy_for_object_type( \'category\', \'attachment\' );
}
add_action( \'init\' , \'add_categories_for_attachments\' );

// add tags for attachments
function add_tags_for_attachments() {
    register_taxonomy_for_object_type( \'post_tag\', \'attachment\' );
}
add_action( \'init\' , \'add_tags_for_attachments\' );

一切都很好。我可以上传，它正在工作。我可以在背面的媒体库中选择类别。现在我只需要一个复选框或列表来选择existant category，以便在上载之前将其附加到上载的媒体。

我现在不知道我是否清楚，但我不是英语母语。：）

谢谢大家！

function add_category_automatically($post_ID) {
    $attach = get_post($post_ID);
    if ($attach->post_parent) {
        $cats = get_the_category()($attach->post_parent);
        foreach ($cats as $cat) {
            wp_set_object_terms($post_ID, $cat->slug, \'category\', true);
        }
    }
}
add_action(\'add_attachment\', \'add_category_automatically\');