此解决方案将在您的Edit Post 屏幕并显示四个其他表单字段-

然后，它会将数据保存到相应的DB表中，每个字段按您的指定在其自己的列中。因为您没有提供我猜到的表名wp_additional_post_info, 但如果你愿意，你可以改变。

我没有向您提供任何内容，但是如果您想让metabox看起来更好一些，如果您愿意，可以添加一些CSS。

DB表这是DB表wp_additional_post_info. 它的设置是为了在删除帖子时，此表中的相关信息也将从DB中删除。

SET SQL_MODE = "NO_AUTO_VALUE_ON_ZERO";
SET time_zone = "+00:00";

CREATE TABLE IF NOT EXISTS `wp_additional_post_info` (
  `post_id` bigint(20) unsigned NOT NULL DEFAULT \'0\',
  `name` text NOT NULL,
  `position` text NOT NULL,
  `publications` longtext NOT NULL,
  `freetext` longtext NOT NULL,
  PRIMARY KEY (`post_id`),
  UNIQUE KEY `post_id` (`post_id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

ALTER TABLE `wp_additional_post_info`
  ADD CONSTRAINT `Costrain additional post info` FOREIGN KEY (`post_id`) REFERENCES `fgw_2_posts` (`ID`) ON DELETE CASCADE ON UPDATE NO ACTION;

/**
 * Add a metaboxs
 */
add_action( \'add_meta_boxes\', \'my_add_addition_post_info_meta_box\' );
function my_add_addition_post_info_meta_box(){

    add_meta_box(
        \'my_addition_post_info\',                                // ID
        __(\'Additional Information\', \'myplugin_textdomain\'),    // Title
        \'my_fill_addition_post_info_meta_box\',                  // Callback
        \'post\'                                                  // Post type
    );
    
}

/**
 * Print metabox content
 * 
 * @param required WP_Post $post    The object for the current post/page
 */
function my_fill_addition_post_info_meta_box($post){

    /** Add a nonce field for security */
    wp_nonce_field( \'my_addition_post_info\', \'my_addition_post_info_nonce\' );
    
    /** Grab the additional info for this post */
    global $wpdb;
    $query = $wpdb->prepare(\'
        SELECT *
        FROM %1$s AS a
        WHERE a.post_id = %2$s\',
        $wpdb->prefix . \'additional_post_info\',
        $post->ID
    );
    $info = $wpdb->get_row($query);
    
    /**
     * Output your form fields
     */
    
    echo \'<div class="additional-field">\';
    echo \'<label for="additional-name">Name</label>\';
    printf(
        \'<input type="text" id="additional-name" name="additional-name" value="%1$s" />\',
        $info->name
    );
    echo \'</div>\';
    
    echo \'<div class="additional-field">\';
    echo \'<label for="additional-position">Position</label>\';
    printf(
        \'<input type="text" id="additional-position" name="additional-position" value="%1$s" />\',
        $info->position
    );
    echo \'</div>\';
    
    echo \'<div class="additional-field">\';
    echo \'<label for="additional-publications">Publications</label>\';
    echo \'<textarea type="text" id="additional-publications" name="additional-publications">\';
    echo $info->publications;
    echo \'</textarea>\';
    echo \'</div>\';
    
    echo \'<div class="additional-field">\';
    echo \'<label for="additional-freetext">Freetext</label>\';
    echo \'<textarea type="text" id="additional-freetext" name="additional-freetext">\';
    echo $info->freetext;
    echo \'</textarea>\';
    echo \'</div>\';
    
}

/**
 * Save metabox content
 *
 * @param required integer  $post_id The ID of the post being saved
 */
add_action( \'save_post\', \'my_save_addition_post_info_meta_box\' );
function my_save_addition_post_info_meta_box( $post_id ) {

    /** Check if the required nonce is set */
    if(!isset($_POST[\'my_addition_post_info_nonce\']))
        return;
    
    /** Verify that the required nonce is valid */
    if (!wp_verify_nonce($_POST[\'my_addition_post_info_nonce\'], \'my_addition_post_info\'))
        return;
    
    /** Ensure that this is not an autosave */
    if(defined(\'DOING_AUTOSAVE\') && DOING_AUTOSAVE)
        return;
    
    /** Ensure that the user has permission to be here */
    if(!current_user_can(\'edit_post\', $post_id))
        return;
    
    /** Finally replace (or create) an entry for this post */
    global $wpdb;
    $table = $wpdb->prefix . \'additional_post_info\';
    $data = array(
        \'post_id\'       => $post_id,
        \'name\'          => $_POST[\'additional-name\'],
        \'position\'      => $_POST[\'additional-position\'],
        \'publications\'  => $_POST[\'additional-publications\'],
        \'freetext\'      => $_POST[\'additional-freetext\']
    );
    $format = array(\'%d\', \'%s\', \'%s\', \'%s\', \'%s\');
    $wpdb->replace($table, $data, $format);
    
}