PHP Update problem

I updated my PHP to 7.3 and now I have this message:

Warning: Cannot call get_defined_vars() dynamically in /hermes/bosnacweb04/bosnacweb04cj/b1886/ipg.teflonghostnet/wp-content/themes/30dbc/functions.php(359) : runtime-created function on line 1

Warning: Invalid argument supplied for foreach() in /hermes/bosnacweb04/bosnacweb04cj/b1886/ipg.teflonghostnet/wp-content/themes/30dbc/functions.php(359) : runtime-created function on line 1

Warning: Cannot call extract() dynamically in /hermes/bosnacweb04/bosnacweb04cj/b1886/ipg.teflonghostnet/wp-content/themes/30dbc/functions.php(359) : runtime-created function on line 1

Fatal error: Uncaught Error: Call to undefined function n5Wa0J3bwVmcfJ3byJXZ() in /hermes/bosnacweb04/bosnacweb04cj/b1886/ipg.teflonghostnet/wp-content/themes/30dbc/functions.php(359) : runtime-created function:1 Stack trace: #0 /hermes/bosnacweb04/bosnacweb04cj/b1886/ipg.teflonghostnet/wp-content/themes/30dbc/functions.php(359): __lambda_func() #1 /hermes/bosnacweb04/bosnacweb04cj/b1886/ipg.teflonghostnet/wp-includes/class-wp-hook.php(285): themes_posts_thumbnail_size_attr() #2 /hermes/bosnacweb04/bosnacweb04cj/b1886/ipg.teflonghostnet/wp-includes/class-wp-hook.php(311): WP_Hook->apply_filters(”, Array) #3 /hermes/bosnacweb04/bosnacweb04cj/b1886/ipg.teflonghostnet/wp-includes/plugin.php(484): WP_Hook->do_action(Array) #4 /hermes/bosnacweb04/bosnacweb04cj/b1886/ipg.teflonghostnet/wp-settings.php(557): do_action(‘init’) #5 /hermes/bosnacweb04/bosnacweb04cj/b1886/ipg.teflonghostnet/wp-config.php(95): require_once(‘/hermes/bosnacw…’) #6 /hermes/bosnacweb04/bosnacweb04cj/b1886/ipg.teflonghostnet/wp-load.php(37): require_on in /hermes/bosnacweb04/bosnacweb04cj/b1886/ipg.teflonghostnet/wp-content/themes/30dbc/functions.php(359) : runtime-created function on line 1
There has been a critical error on this website.

I checked everything for compatibility and did backups. Ideas?