Bulk_Theme_Upgrader_Skin

• 用于WordPress主题升级的批量主题升级皮肤。

示例：

class Bulk_Theme_Upgrader_Skin extends Bulk_Upgrader_Skin {

    public $theme_info = array(); // Theme_Upgrader::bulk_upgrade() will fill this in.

    public function add_strings() {

        parent::add_strings();

        $this->upgrader->strings['skin_before_update_header'] = __( 'Updating Theme %1$s (%2$d/%3$d)' );

    }