To convert IDN Domains with the IDNA2008 definition use following command.
idn_to_ascii('teßt.com',IDNA_NONTRANSITIONAL_TO_ASCII,INTL_IDNA_VARIANT_UTS46)
The result is then as expected
xn--tet-6ka.com
(PHP 5 >= 5.3.0, PHP 7, PHP 8, PECL intl >= 1.0.2, PECL idn >= 0.1)
idn_to_ascii — Преобразовывает доменное имя в формат IDNA ASCII
Процедурный стиль
$domain,$flags = IDNA_DEFAULT,$variant = INTL_IDNA_VARIANT_UTS46,&$idna_info = nullЭта функция преобразовывает доменное имя из Unicode в IDNA ASCII.
domainИмя для преобразования, должно быть в кодировке UTF-8.
flagsОпции преобразования — комбинация констант IDNA_* (кроме констант IDNA_ERROR_*).
variant
INTL_IDNA_VARIANT_2003 (объявлена устаревшей начиная с PHP 7.2.0) для IDNA 2003 или
INTL_IDNA_VARIANT_UTS46 (доступна только с ICU 4.6) для UTS #46.
idna_info
Этот параметр используется только если используется
INTL_IDNA_VARIANT_UTS46 в
variant. В этом случае он будет заполнен
массивом с ключами 'result', возможными ошибочными
результатами преобразования, 'isTransitionalDifferent',
логическое выражение означает изменило или могло бы изменить результат
при использовании сквозного механизма UTS #46, и 'errors',
содержащими целочисленное представление битовой маски из констант
IDNA_ERROR_*.
Доменное имя в представлении ASCII или false, если возникла ошибка.
| Версия | Описание |
|---|---|
| 7.4.0 |
Теперь значение по умолчанию variant изменено на
INTL_IDNA_VARIANT_UTS46 вместо устаревшей константы
INTL_IDNA_VARIANT_2003.
|
| 7.2.0 |
INTL_IDNA_VARIANT_2003 объявлена устаревшей, вместо неё
используйте INTL_IDNA_VARIANT_UTS46.
|
Пример #1 Пример использования idn_to_ascii()
<?php
echo idn_to_ascii('täst.de');
?>Результат выполнения приведённого примера:
xn--tst-qla.de
To convert IDN Domains with the IDNA2008 definition use following command.
idn_to_ascii('teßt.com',IDNA_NONTRANSITIONAL_TO_ASCII,INTL_IDNA_VARIANT_UTS46)
The result is then as expected
xn--tet-6ka.comThe notes on this function are not very clear and a little misleading.
Firstly, <=5.3, you will need to make use of one of several scripts or classes available on the internet which might, or might not, require the installation of of the intl and idn PECL extensions ...and you will need to have !<4.0 in order to be able to install both.
Secondly, if you have >=5.4 you will not require the PECL extensions.
Third, use of utf8_encode() is not necessary. In fact, it will potentially prevent idn_to_ascii() from working at all.
On my setup it was necessary to change the charset in the script meta tags to UTF-8:
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
...and to change charset_default in the php.ini file (/usr/local/lib/php.ini, whereis php.ini, find / -name php.ini):
default_charset = "UTF-8"
The above changes mean that idn_to_ascii() can now be used with that syntax (no need for utf8_encode()). Previously, the function worked to convert some IDNs, but failed to convert Japanese and Cyrillic IDNs. Further, no additional locales were enabled or added, and Apache's charset file was left unmodified.
It is also important to remember only to apply the function where required, eg:
idn_to_ascii(cåsino.com) // is wrong
...whereas...
iden_to_ascii(cåsino) // is right
...and also be aware of text editors that don't support UTF-8 encoding, or the $domain = 'cåsino' value will end up as $domain = '??????' ...and the function will fail.
I have found that Notepad++ easily and reliably handles UTF-8 encoding that works for this function using UTF-8 as the encoding option, not UTF-8 without BOM.idn_to_ascii and idn_to_utf8 functions don't properly handle full URLs (i.e. with schema and paths), so here's the helper functions which handles all URLs, including ones with path but without a scheme
<?php
/**
* Converts URLS to punycode
* It doesn't url-encodes other parts
* The initial code from snipp dor ru website, here is modified version that handles urls without scheme
*/
function punycode_encode($url)
{
$no_scheme = false;
if (!preg_match('/^.+?:\/\//', $url) && substr($url, 0, 2) !== '//') {
$url = '//' . $url;
$no_scheme = true;
}
$parts = parse_url($url);
$out = '';
if (!empty($parts['scheme'])) $out .= $parts['scheme'] . ':';
if (!empty($parts['host'])) $out .= '//';
if (!empty($parts['user'])) $out .= $parts['user'];
if (!empty($parts['pass'])) $out .= ':' . $parts['pass'];
if (!empty($parts['user'])) $out .= '@';
if (!empty($parts['host'])) $out .= idn_to_ascii($parts['host']);
if (!empty($parts['port'])) $out .= ':' . $parts['port'];
if (!empty($parts['path'])) $out .= $parts['path'];
if (!empty($parts['query'])) $out .= '?' . $parts['query'];
if (!empty($parts['fragment'])) $out .= '#' . $parts['fragment'];
if ($no_scheme) {
$out = substr($out, 2);
}
return $out;
}
function punycode_decode($url)
{
$no_scheme = false;
if (!preg_match('/^.+?:\/\//', $url) && substr($url, 0, 2) !== '//') {
$url = '//' . $url;
$no_scheme = true;
}
$parts = parse_url($url);
$out = '';
if (!empty($parts['scheme'])) $out .= $parts['scheme'] . ':';
if (!empty($parts['host'])) $out .= '//';
if (!empty($parts['user'])) $out .= $parts['user'];
if (!empty($parts['pass'])) $out .= ':' . $parts['pass'];
if (!empty($parts['user'])) $out .= '@';
if (!empty($parts['host'])) $out .= idn_to_utf8($parts['host']);
if (!empty($parts['port'])) $out .= ':' . $parts['port'];
if (!empty($parts['path'])) $out .= $parts['path'];
if (!empty($parts['query'])) $out .= '?' . $parts['query'];
if (!empty($parts['fragment'])) $out .= '#' . $parts['fragment'];
if ($no_scheme) {
$out = substr($out, 2);
}
return $out;
}The documentation ist not clear what failure in the return section means. This should be substituted to something like this:
"Returns failure if the given string could not be converted".