Clean a string to latin equivalent

cleanString.php

<?php
/**
 * Clean a string and return it with only letters, numbers, «.», «-» and «_»
 * Spaces are replaced by «_»
 */
    public function cleanName(string $filename) : string
    {
        return preg_replace("/[^.a-zA-Z0-9_-]+/", "",
            transliterator_transliterate('Any-Latin;Latin-ASCII;',
                str_replace(' ', '_', $filename)));
    }