我正在开发一个插件，为我的主题添加一个自定义帖子类型。这是一个零售目录，帖子类型是零售列表。

一切正常。我可以将内容上传到DB，然后在我开发的定制CSS框架中打印。然而，当我想上传和显示图像时，我就遇到了问题。

上载图像时出现问题。我使用update\\u post\\u meta（）来更新与post ID相关的图像的元信息，并将其发布到“meta\\u value”列下的数据库表“wp\\u postmeta”。我还使用WP media upload JQuery代码来选择图像。我不确定问题到底出在哪里，但我知道这与上载有关，因为当图像进入“meta\\u value”列时，它的值是NaN，而不是应该的ID值。

以下是上载代码：

add_action( \'save_post\', \'process_image_meta\', 10, 2 );

function process_image_meta( $post_id, $post ) {
        update_post_meta( $post_id, \'_image_id\', $_POST[\'upload_image_id\'] );
    }

最后，显示代码：

function display_retail_listing_meta_box($retail_listing) {
    // Retrieve current shop details based on retail lisitng ID

    global $post;

        $image_src = \'\';
    $image_id = get_post_meta( $post->ID, \'_image_id\', true);
    $image_src = wp_get_attachment_url( $image_id );
?>

<table>
<tr>
<td style="width: 100%">Image Upload</td>
<td><img id="shop_image" src="<?php echo $image_src; ?>" style="max-width:100%;" />
<input type="text" name="upload_image_id" id="upload_image_id" value="<?php echo $image_id; ?>" />
<a title="<?php esc_attr_e( \'Upload Image\' ) ?>" href="#" id="upload-image"><?php _e( \'Upload Image\' ) ?></a>
<a title="<?php esc_attr_e( \'Remove Image\' ) ?>" href="#" id="remove-image" style="<?php echo ( ! $image_id ? \'display:none;\' : \'\' ); ?>"><?php _e( \'Remove Image\' ) ?></a>
</tr>
</table>

jQuery(document).ready(function($) {

        // save the send_to_editor handler function
        window.send_to_editor_default = window.send_to_editor;

        $(\'#upload-image\').click(function(){

            // replace the default send_to_editor handler function with our own
            window.send_to_editor = window.attach_image;
            tb_show(\'\', \'media-upload.php?$post_id=<?php echo $post->ID ?>&amp;type=image&amp;TB_iframe=true\');

            return false;
        });

        $(\'#remove-image\').click(function() {

            $(\'#upload_image_id\').val(\'\');
            $(\'img\').attr(\'src\', \'\');
            $(this).hide();

            return false;
        });

        // handler function which is invoked after the user selects an image from the gallery popup.
        // this function displays the image and sets the id so it can be persisted to the post meta
        window.attach_image = function(html) {

            // turn the returned image html into a hidden image element so we can easily pull the relevant attributes we need
            $(\'body\').append(\'<div id="temp_image">\' + html + \'</div>\');

            var img = $(\'#temp_image\').find(\'img\');

            imgurl   = img.attr(\'src\');
            imgclass = img.attr(\'class\');
            imgid    = parseInt(imgclass.replace(/\\D/g, \'\'), 10);

            $(\'#upload_image_id\').val(imgid);
            $(\'#remove-image\').show();

            $(\'img#shop_image\').attr(\'src\', imgurl);
            try{tb_remove();}catch(e){};
            $(\'#temp_image\').remove();

            // restore the send_to_editor handler function
            window.send_to_editor = window.send_to_editor_default;

        }

    });
    </script>