URL Slugs in PHP (with UTF-8 and Transliteration Support)

slugify.php

<?php
function slugify(string $input): string
{
    $transliterated = transliterator_transliterate('Any-Latin; Latin-ASCII; Lower()', $input);

    return trim(preg_replace('/[^a-z0-9]+/', '-', $transliterated), '-');

}

$string = 'Hello, World!';
var_dump(slugify($string)); // outputs "string(11) "hello-world""