how can i implement one of your widgets in a .ph

Hi Charles, 
Thanks for reaching us. 
I wonder if you did purchase our UB Content Slider using another profile at Ubertheme? If you purchase the extension via other channel, kindly provide us proof of purchase via our email info (at) ubertheme.com. 
 
My apology for this extra step. 
Regards,
An Nguyen

Hi Charles, 
Below is an example to call a Magento core widget by short code. You can replace your widget short code with UB Content Slider: 

<?php
     $om = \Magento\Framework\App\ObjectManager::getInstance();
     $filterProvider = $om->create('\Magento\Cms\Model\Template\FilterProvider');
     $widgetContent = '{{widget type="Magento\Catalog\Block\Product\Widget\NewWidget" display_type="all_products" show_pager="1" products_per_page="8" products_count="8" template="product/widget/new/content/new_grid.phtml" page_var_name="pnulcn"}}';
     echo $filterProvider->getBlockFilter()->filter($widgetContent);
 ?>

 
Hope that helps. 
Regards,
An Nguyen