I would like to contribute a very simple case I found in a WordPress theme and it seems to work fine:

Has the followingadd_filterstatement:

add_filter( 'option_page_capability_' . ot_options_id(), create_function( '$caps', "return '$caps';" ), 999 );

Replace it with:

add_filter( 'option_page_capability_' . ot_options_id(), function($caps) {return $caps;},999);

We can see the usage of function(), which is a very typical function creation, instead of using the deprecated create_function() to create a function.

You should be able to useanonymous functions(aka closures) calls to parent scope$delimitervariables like this:

$callbacks[$delimiter] = function($matches) use ($delimiter) { return $delimiter . strtolower($matches[1]); };