(PHP 5 >= 5.3.0, PECL intl >= 1.0.2, PECL idn >= 0.1)
idn_to_ascii — Convert domain name to IDNA ASCII form.
Procedural style
This function converts Unicode domain name to IDNA ASCII-compatible format.
Domain to convert. In PHP 5 must be UTF-8 encoded.
Conversion options - combination of IDNA_* constants.
Domain name encoded in ASCII-compatible form. 或者在失败时返回 FALSE
Example #1 idn_to_ascii() example
<?php
echo idn_to_ascii('täst.de');
?>
以上例程会输出：
xn--tst-qla.de