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 — Convierte un nombre de dominio a formato IDNA ASCII
Estilo por procedimientos
$domain,$options = 0,$variant = INTL_IDNA_VARIANT_2003,&$idna_info = ?Esta función convierte un dominio Unicode al formato IDNA ASCII-compatible.
domainDominio a convertir. En PHP 5 debe estar previamente codificado en UTF-8.
optionsOpciones de conversión - combinación de constantes IDNA_* (excepto las constantes IDNA_ERROR_*).
variant
INTL_IDNA_VARIANT_2003 para IDNA 2003 o
INTL_IDNA_VARIANT_UTS46 para UTS #46.
idna_info
Este parámetro sólo se puede usar si
INTL_IDNA_VARIANT_UTS46 se utilizó para
variant. En este caso, será llenado con un
array con las claves 'result', la posibilidad de
un resultado ilegal de la transformación,
'isTransitionalDifferent', un booleano indicando
si el uso de los mecanismos de transición de UTS #46 ha cambiado
o debería haber cambiado el resulado, y 'errors',
que es de tipo int y representa un conjunto de bits de las
constantes de error IDNA_ERROR_*.
Nombre del dominio codificado en formato ASCII-compatible. o false en caso de error
| Versión | Descripción |
|---|---|
| 5.4.0/PECL 2.0.0b1 |
Se añadieron los parámetros variant y
idna_info; y el soporte para UTS #46.
|
Ejemplo #1 Ejemplo de idn_to_ascii()
<?php
echo idn_to_ascii('täst.de');
?>El resultado del ejemplo sería:
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".