我正在添加媒体弹出屏幕中创建一个复选框，以将HTML添加到$html 插入图像时输出。

这很好用。但是，一旦我添加了选中复选框的图像。如果我再次尝试添加它，并取消选中复选框，它将不会注册或保存更改。

因此，始终输出修改后的图像，而不是在取消选中后恢复为WP默认值。

加上选中并插入页面后的复选标记，我每次选择该图像时都会保持预选状态。

如何使“取消选择”复选框按预期运行？

非常感谢您的帮助。谢谢

        class media_uploader_cb{

    function __construct(){
        // attach our function to the correct hook
        add_filter(\'attachment_fields_to_edit\',  array( $this, \'attachment_fields_to_edit\' ), 10, 2);
        //save attachment field
        add_filter( \'attachment_fields_to_save\', array( $this, \'attachment_fields_to_save\' ), 10, 2);
        //add custom css class
        add_filter( \'media_send_to_editor\',      array( $this, \'media_send_to_editor\' ), 10, 2 );
    }

    /**
     * Adding our custom checkbox field to the $form_fields array
     * 
     * @param array $form_fields
     * @param object $post
     * @return array
     */
    function attachment_fields_to_edit($form_fields, $post) {
        $form_fields[\'add_class\'][\'label\'] = __("Add SEO Data");
        $form_fields[\'add_class\'][\'input\'] = \'html\';
        $form_fields[\'add_class\'][\'html\'] = \'<input type="checkbox" value="1" name="attachments[\'.$post->ID.\'][add_class]" id="attachments[\'.$post->ID.\'][add_class]" \'.checked( 1, get_post_meta($post->ID, \'add_class\', true), false ).\'/>\';
        return $form_fields;
    }


    /**
     * Saving our custom checkbox field
     * @param array $post
     * @param array $attachment
     * @return array
     */
    function attachment_fields_to_save($post, $attachment) {

        if( isset($attachment[\'add_class\']) ){
            update_post_meta($post[\'ID\'], \'add_class\', $attachment[\'add_class\']);
        }
        return $post;
    }

    /**
     * Adding our custom css class based on checkbox field 
     * 
     * @param string  $html
     * @param int $id
     * @return string
     */
    function media_send_to_editor( $html, $id ) {
        //only add class if the checkbox was checked
        if ( 1 == (int)get_post_meta($id, \'add_class\', true) ){
            //change this to whatever you want
            $seo_data_to_add = \'custom="HTML Output Here""\';

            // THIS SHOULD BE THE CHECKBOX
            get_post_meta($id, \'add_class\', true);

            $attachment_title = get_the_title($id);
            $title = \'title="\'.$attachment_title .\' by \'. get_option(\'ews_opt_branding\') .\'"\';
            $html = str_replace(\'<img\', \'<img \'.$title.\' \'.$seo_data_to_add.\'\', $html);
        }
        return $html;
    }


}

new media_uploader_cb();