add_filter( 'option_page_capability_' . ot_options_id(), create_function( '$caps', "return '$caps';" ), 999 );
How to write this correctly so that there is no error:
Deprecated: Function
create_function()is deprecated
Use an anonymous function:
add_filter( 'option_page_capability_' . ot_options_id(), function($caps) {return $caps;}, 999 );
Keep in mind that this will have different functionality to your code, as your code substitutes $caps in function definition, which is buggy and asking for a code injection.