nice php-code-adding to a custom post type

I had (I think it was Ashok) writing me some nice php-code-adding to a custom post type… now I will loose this type when switching the theme and I would like to insert it there in my new – made with custom press – post-type. However, somehow php is too much a mystery to me to get it done.

If you watch here https://www.hotel-oberkirch.de/en/room/suite/ – you see the red rectangle “Buchen – booking….” above the content… it is thanks to this php-lines in the template:

<?php if ( ! wp_is_mobile() ) { echo do_shortcode(‘[intense_collapsibles][intense_collapse title=”Buchen | Booking | Réserver | Prenotare | Reservar” title_background_color=”#990033″ title_font_color=”#ffffff”][iframe src = “http://www.caesar-data.com/cgi-bin/buchen.cgi?oberkirchfreiburg” width = “100%” height = “620” scrolling = “yes” seamless][/intense_collapse][/intense_collapsibles] ‘:wink:; } ?>

The problem is that while the future theme (Customizr pro) gets me off these creepy errors I see in the console now and while it is very nice prorgrammed in terms of CSS-tweaking I am not expert enough to find out how to handle templates there – as the architecture is different and contrary to the old theme when reading the php lines I do not understand what is happening

important: it is not about the current theme… it’s about the future (already installed and nearly ready-to-go theme)

So any template deriving from the current theme would not help