grapheme_substr
idn_to_ascii
intl
PHP Manual
IDN Funciones
Table of Contents
idn_to_ascii
— Convert domain name to IDNA ASCII form.
idn_to_unicode
— Alias de idn_to_utf8
idn_to_utf8
— Convert domain name from IDNA ASCII to Unicode.
grapheme_substr
idn_to_ascii
intl
PHP Manual