Polyfill for the strftime function that was deprecated in PHP 8.1.0
The goal was to replace the strftime function with an equivalent that offers close to zero friction. The alternative offered by current versions of PHP is unnecessarily complicated and object-oriented. Date formatting should be simple and procedural.
strftime_polyfill($format[,$timestamp,$locale]):string|false
$format - date format, more information here: https://www.php.net/manual/en/function.strftime.php
$timestamp - UNIX timestamp, time() if it's not defined
$locale - two letter string defining the language of the days of the week and months (e.g. ro), en if it's not defined
Formated date/time or false if $format is not defined or empty.