<?php

$uconv = new UConverter('latin-1', 'UTF-8');
echo $uconv->convert('äüöß');

echo PHP_EOL;

echo UConverter::transcode('äüöß', 'latin-1', 'UTF-8');

äüöß
äüöß

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PHP 8.3, Laminas MVC 3.2, Symfony 5.2, Laravel 8.28, PHPUnit 9.5, Doctrine ORM 2.8