你的问题很小，但我会试一试。

您需要为您的值添加一个元框save_post 将数据保存到$wpdb->postmeta

function generic_box() {
    add_meta_box(
        \'generic_box\', // id, used as the html id att
        __( \'Generic Title\' ), // meta box title
        \'generic_cb\', // callback function, spits out the content
        \'post\', // post type or page. This adds to posts only
        \'side\', // context, where on the screen
        \'low\' // priority, where should this go in the context
    );
}
function generic_cb() {
  echo \'generic content\';
}
add_action( \'add_meta_boxes\', \'generic_box\' );

function generic_save($post_id) {
  // use $post_id and the global $_POST variable to process information
  // use update_post_meta() to save information
}
add_action(\'save_post\',\'generic_save\');

function generic_pre_get_posts($qry) {
  if (is_feed()) {
    // alter your query
  }
}
add_action(\'pre_get_posts\',\'generic_pre_get_posts\');