How to use mbstring.func_overload 2 for xampp?

This parameter php_admin_value mbstring.func_overload 2prescribed specifically for one site, but for some reason it affects everything stops working phpmyadmin, if it is clear that everything works.
<VirtualHost *:80>
 ServerAdmin webmaster@maov.local
 DocumentRoot "C:/Users/mavpo/Documents/Xampp/htdocs/maov.local"
 ServerName marov.local
 ServerAlias www.maov.local
 #ErrorLog "logs/maov.local-error.log"
 #CustomLog "logs/maov.local-access.log" common
 php_admin_value mbstring.func_overload 2
April 7th 20 at 15:32
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