- mb_strpos: documentation ( source)
- var_dump: documentation ( source)
- strpos: documentation ( source)
<?php
$needle = Normalizer::normalize('äöüß', Normalizer::FORM_D);
$haystack = Normalizer::normalize('Täöüßtstring', Normalizer::FORM_C);
var_Dump(strpos($haystack, $needle));
var_Dump(mb_Strpos($haystack, $needle));