我为特定页面模板创建了metabox。现在我需要保存复选框的选中或未选中值。我该怎么做？

这是我的代码：

    add_action(\'add_meta_boxes\', \'add_home_meta\');
function add_home_meta()
{
    global $post;

    if(!empty($post))
    {
        $pageTemplate = get_post_meta($post->ID, \'_wp_page_template\', true);

        if($pageTemplate == \'template-home.php\' )
        {
            add_meta_box(
                \'home_meta\', // $id
                \'Homepage Options\', // $title
                \'display_home_meta\', // $callback
                \'page\', // $page
                \'normal\', // $context
                \'high\'); // $priority
        }
    }
}

function display_home_meta() {
  global $post;
    // Add the HTML for the post meta
wp_nonce_field( \'avt_homepage_meta_box\', \'avt_homepage_meta_box_nonce\' );

      /*
       * Use get_post_meta() to retrieve an existing value
       * from the database and use the value for the form.
       */
      $value = get_post_meta( $post->ID, \'home_slider_display\', true ); 
      ?>
      <p>
        <label for="avt_slider_slide_url">
            <strong><?php _e( \'Display slider on homepage:\', \'avt\' ); ?></strong>
        </label>
        <input type="checkbox" name="home_slider_display" value="true" />
      </p>
<?php    }

function avt_homepage_save_meta_box_data( $post_id ) {

      // Check if our nonce is set.
      if ( ! isset( $_POST[\'avt_homepage_meta_box_nonce\'] ) ) {
        return;
      }

      // Verify that the nonce is valid.
      if ( ! wp_verify_nonce( $_POST[\'avt_homepage_meta_box_nonce\'], \'avt_homepage_meta_box\' ) ) {
        return;
      }

      // If this is an autosave, our form has not been submitted, so we don\'t want to do anything.
      if ( defined( \'DOING_AUTOSAVE\' ) && DOING_AUTOSAVE ) {
        return;
      }

      // Check the user\'s permissions.
      if ( isset( $_POST[\'post_type\'] ) && \'page\' == $_POST[\'post_type\'] ) {

        if ( ! current_user_can( \'edit_page\', $post_id ) ) {
          return;
        }

      } else {

        if ( ! current_user_can( \'edit_post\', $post_id ) ) {
          return;
        }
      }

      /* OK, its safe for us to save the data now. */

      // Make sure that it is set.
      if ( ! isset( $_POST[\'home_slider_display\'] ) ) {
        return;
      }

      // Sanitize user input.
      $my_data = sanitize_text_field( $_POST[\'home_slider_display\'] );

      // Update the meta field in the database.
      update_post_meta( $post_id, \'home_slider_display\', $my_data );
    }
    add_action( \'save_post\', \'avt_homepage_save_meta_box_data\' );