Function create_function() is deprecated in PHP 7.2

Thank you for updating Hiero.

I notice that you use create_function() which is now deprecated in PHP 7.2.
May you please convert all create_function() instances to Anonymous Function please?
This will support future and current PHP versions.

Thank you.
— Regards, Sam Katakouzinos

References;
https://www.php.net/manual/en/function.create-function.php
https://www.php.net/manual/en/functions.anonymous.php
https://www.tomasvotruba.cz/blog/2018/12/17/function-create-function-is-deprecated-in-php-72-how-to-migrate/

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