PHP 8.0 error: Call to undefined function create_function

[copongracz]

Hello.

Our theme’s revslider plugin is reporting the following error when switching to PHP 8.0:

[30-Jan-2023 15:29:41 UTC] PHP Fatal error:  Uncaught Error: Call to undefined function create_function() in /mnt/.../wp-content/plugins/revslider/includes/framework/functions-wordpress.class.php:258
Stack trace:
#0 /mnt/.../wp-content/plugins/revslider/revslider.php(86): RevSliderFunctionsWP::registerWidget()
#1 /mnt/.../wp-settings.php(447): include_once('...')
#2 /mnt/.../wp-config.php(106): require_once('...')
#3 /mnt/.../wp-load.php(50): require_once('...')
#4 /mnt/.../wp-blog-header.php(13): require_once('...')
#5 /mnt/.../index.php(17): require('...')
#6 {main}
  thrown in /mnt/.../wp-content/plugins/revslider/includes/framework/functions-wordpress.class.php on line 258

We just upgraded our Unicon theme (Version: 2.3.2) and I have updated to the latest Slider Revolution version found in your forum (V6.6.10), but the issue remains…

Thanks in advance.

Ticket