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