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 — Convertit un nom de domaine au format IDNA ASCII
Style procédural
$domain,$flags = IDNA_DEFAULT,$variant = INTL_IDNA_VARIANT_UTS46,&$idna_info = nullCette fonction convertit un nom de domaine Unicode au format IDNA ASCII-compatible.
domainLe domaine à convertir, qui doit être encodé UTF-8.
flagsOptions de conversion - combinaison de constantes IDNA_*. (sauf les constantes IDNA_ERROR_*).
variant
Soit INTL_IDNA_VARIANT_2003 (obsolète à partir de PHP
7.2.0) pour IDNA 2003, soit INTL_IDNA_VARIANT_UTS46
(seulement disponible à partir de ICU 4.6) pour UTS #46.
idna_info
Ce paramètre ne peut être utilisé que si la cosntante
INTL_IDNA_VARIANT_UTS46 a été utilisée dans
le paramètre variant. Dans ce cas, ce sera
un tableau avec la clé 'result' contenant le résultat
de la transformation, la clé 'isTransitionalDifferent'
contenant un booléen indiquant l'utilisation du mécanisme transitionnel
UTS #46 ayant altéré ou non le résultat, et la clé
'errors' contenant un int représentant
un jeu de bits des constantes d'erreurs IDNA_ERROR_*.
Le nom de domaine encodé au format ASCII-compatible. ou false si une erreur survient
| Version | Description |
|---|---|
| 7.4.0 |
La valeur par défaut du paramètre variant est
maintenant INTL_IDNA_VARIANT_UTS46 à la place
de la constante INTL_IDNA_VARIANT_2003 déprécié.
|
| 7.2.0 |
INTL_IDNA_VARIANT_2003 a été déprécié; utiliser
INTL_IDNA_VARIANT_UTS46 à la place.
|
Exemple #1 Exemple avec idn_to_ascii()
<?php
echo idn_to_ascii('täst.de');
?>L'exemple ci-dessus va afficher :
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".