<?php
$flagUA = '🇺🇦';
$flagPS = '🇵🇸';

echo grapheme_levenshtein($flagUA, $flagPS, 1, 10, 100), "\n";
?>
10

%|cccccc|0||009900|1||000099|0|%
%┃┃┗━ insertion%
%┃┗━━ replacement%
%┗━━━ deletion%