If you look at how the code works, 你应该注意到主题mod保存在*_options 下的表格theme_mods_{theme_slug} 主题slug是包含主题样式表的目录名，因此：

$ptheme = get_template_directory();
$theme_slug = basename($ptheme);
$mods = get_option( "theme_mods_$theme_slug");

function get_parent_theme_mods($mod = \'\') {
  $ptheme = get_template_directory();
  $theme_slug = basename($ptheme);
  $mods = get_option( "theme_mods_{$theme_slug}");
  if (!empty($mods) && isset($mods[$mod])) {
    $mods = $mods[$mod];
  }
  return $mods;
}
var_dump(get_parent_theme_mods());
var_dump(get_parent_theme_mods(\'background_color\'));