我不知道如何保存此元数据库，请帮助我。这是我的代码：

<?php

function book_function_meta_box(){
 add_meta_box(\'book_meta_box\', \'more Infos\', \'book_meta_box_callback\', \'book\', \'normal\');
}

add_action(\'add_meta_box\', \'book_add_meta_box\');


function book_meta_box_callback()
{
    wp_nonce_field(\'book_save_meta_box_data\', \'book_nonce_name\');

    $terms = get_terms(
        \'category\',
        array(
            \'orderby\'    => \'id\',
            \'hide_empty\' => 1 // hide categories with no posts
        )
    );

    foreach ($terms as $term) {


        $args = array(
            \'post_type\' => \'book\',
            \'category\'  => $term->slug
        );

        $query = new WP_Query($args);


        echo \'<h2 class="h2 faq-cat">\' . $term->name . \'</h2>\';

        while ($query->have_posts()) : $query->the_post();

            $livre_slug = sanitize_title_with_dashes(get_the_title(get_the_ID()));

            $qte_slug = $livre_slug . \'qte\';

            ?>
            <div>

                <label for="<?php the_ID(); ?>">
                    <?php echo \'<h1>\' . the_title() . \'</h1>\'; ?>
                </label>
                <input type="checkbox" name="<?php echo $livre_slug; ?>" id="<?php the_ID(); ?>" value="<?php the_title(); ?>" <?php if (isset($_POST[$livre_slug])) echo \'checked="checked"\'; ?> />

                <label for="<?php echo $qte_slug; ?>" style="margin-left: 352px;buttom">
                    <?php echo \'Qte\'; ?>
                </label>

                <input type="number" id="<?php the_ID(); ?>" name="<?php echo $qte_slug; ?>" style="margin-left: 452px;" value="<?php echo esc_attr(get_post_meta(get_the_ID(), $qte_slug, true)); ?>" />

            </div>
            <?php



            wp_reset_postdata();
        endwhile;

        // use reset postdata to restore the original query
        wp_reset_postdata();
    }
}