smarty3 - 3.1.33+20180830.1.3a78a21f+selfpack1-1+deb10u1 main

Smarty is a template engine for PHP. More specifically, it
facilitates a manageable way to separate application logic and content
from its presentation.
.
Smarty 3.1 is a departure from 2.0 compatibility. Most notably, all
backward compatibility has been moved to a separate class file named
SmartyBC.class.php. If you require compatibility with 2.0, you will
need to use this class.