- var_dump: documentation ( source)
- setlocale: documentation ( source)
- iconv: documentation ( source)
<?php
setlocale(LC_ALL, 'de_DE.UTF8');
var_dump(iconv("utf-8","ascii//TRANSLIT",'Äther'));
var_dump(iconv("utf-8","ascii//TRANSLIT",'Regen'));
var_dump(iconv("utf-8","ascii//TRANSLIT",'König'));
var_dump(iconv("utf-8","ascii//TRANSLIT",'Straße'));