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<?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, $needle)); var_dump(grapheme_Strpos($haystack, $needle));
based on CYJtp
Output for 8.0.0rc1 - rc2
bool(false) bool(false) int(1)
Output for 7.2.0 - 7.2.33, 7.3.0 - 7.3.23, 7.4.0 - 7.4.11, 8.0.0alpha1 - beta3
bool(false) bool(false) bool(false)