How to transform preg_replace() to preg_replace_callback() with multiples calls?

Question

I have this line of code:

$from_uk_name = preg_replace("/^_/", "", preg_replace("/([A-Z]{1})/e", "'_'.strtolower($property_name[1])", $from_name))

But since I move the server to PHP 5.5.22 and preg_replace() is deprecated I need to move that line into preg_replace_callback() but has not idea since there are nested preg_replace calls, can I get some advice?

Answer 1

As from the comments requested:

This should work for you:

$from_uk_name = preg_replace("/^_/", "",
            preg_replace_callback("/([A-Z]{1})/", function($m){
                return "'_'" . strtolower($m[1]);
            }, $from_name));