idn_to_utf8

    (PHP 5 >= 5.3.0, PHP 7, PHP 8, PECL intl >= 1.0.2, PECL idn >= 0.1)

    idn_to_utf8 — Convert domain name from IDNA ASCII to Unicode

    Опис

    Процедурний стиль

    idn_to_utf8(
        string $domain,
        int $flags = IDNA_DEFAULT,
        int $variant = INTL_IDNA_VARIANT_UTS46,
        array &$idna_info = null
    ): string|false

    This function converts a Unicode domain name from an IDNA ASCII-compatible format to plain Unicode, encoded in UTF-8.

    Параметри

    domain

    Domain to convert in an IDNA ASCII-compatible format.

    flags

    Conversion options - combination of IDNA_* constants (except IDNA_ERROR_* constants).

    variant

    Either INTL_IDNA_VARIANT_2003 (deprecated as of PHP 7.2.0) for IDNA 2003 or INTL_IDNA_VARIANT_UTS46 (only available as of ICU 4.6) for UTS #46.

    idna_info

    This parameter can be used only if INTL_IDNA_VARIANT_UTS46 was used for variant. In that case, it will be filled with an array with the keys 'result', the possibly illegal result of the transformation, 'isTransitionalDifferent', a boolean indicating whether the usage of the transitional mechanisms of UTS #46 either has or would have changed the result and 'errors', which is an int representing a bitset of the error constants IDNA_ERROR_*.

    Значення, що повертаються

    The domain name in Unicode, encoded in UTF-8, або false в разі помилки

    Журнал змін

    Версія Опис
    7.4.0 The default value of variant is now INTL_IDNA_VARIANT_UTS46 instead of the deprecated INTL_IDNA_VARIANT_2003.
    7.2.0 INTL_IDNA_VARIANT_2003 has been deprecated; use INTL_IDNA_VARIANT_UTS46 instead.

    Приклади

    Приклад #1 idn_to_utf8() example

    <?php

    echo idn_to_utf8('xn--tst-qla.de');

    ?>

    Поданий вище приклад виведе:

    täst.de

    Прогляньте також

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    User Contributed Notes 1 note

    up
    14
    kushik.com
    11 years ago
    <?php
    // for those who has PHP older than version 5.3
    class IDN {
    // adapt bias for punycode algorithm
    private static function punyAdapt(
    $delta,
    $numpoints,
    $firsttime
    ) {
    $delta = $firsttime ? $delta / 700 : $delta / 2;
    $delta += $delta / $numpoints;
    for (    $k = 0; $delta > 455; $k += 36)
    $delta = intval($delta / 35);
    return     $k + (36 * $delta) / ($delta + 38);
    }

    // translate character to punycode number
    private static function decodeDigit($cp) {
    $cp = strtolower($cp);
    if (    $cp >= 'a' && $cp <= 'z')
    return     ord($cp) - ord('a');
    elseif (    $cp >= '0' && $cp <= '9')
    return     ord($cp) - ord('0')+26;
    }

    // make utf8 string from unicode codepoint number
    private static function utf8($cp) {
    if (    $cp < 128) return chr($cp);
    if (    $cp < 2048)
    return     chr(192+($cp >> 6)).chr(128+($cp & 63));
    if (    $cp < 65536) return
    chr(224+($cp >> 12)).
    chr(128+(($cp >> 6) & 63)).
    chr(128+($cp & 63));
    if (    $cp < 2097152) return
    chr(240+($cp >> 18)).
    chr(128+(($cp >> 12) & 63)).
    chr(128+(($cp >> 6) & 63)).
    chr(128+($cp & 63));
    // it should never get here
    }

    // main decoding function
    private static function decodePart($input) {
    if (    substr($input,0,4) != "xn--") // prefix check...
    return $input;
    $input = substr($input,4); // discard prefix
    $a = explode("-",$input);
    if (    count($a) > 1) {
    $input = str_split(array_pop($a));
    $output = str_split(implode("-",$a));
    } else {
    $output = array();
    $input = str_split($input);
    }
    $n = 128; $i = 0; $bias = 72; // init punycode vars
    while (!empty($input)) {
    $oldi = $i;
    $w = 1;
    for (    $k = 36;;$k += 36) {
    $digit = IDN::decodeDigit(array_shift($input));
    $i += $digit * $w;
    if (    $k <= $bias) $t = 1;
    elseif (    $k >= $bias + 26) $t = 26;
    else     $t = $k - $bias;
    if (    $digit < $t) break;
    $w *= intval(36 - $t);
    }
    $bias = IDN::punyAdapt(
    $i-$oldi,
    count($output)+1,
    $oldi == 0
    );
    $n += intval($i / (count($output) + 1));
    $i %= count($output) + 1;
    array_splice($output,$i,0,array(IDN::utf8($n)));
    $i++;
    }
    return     implode("",$output);
    }

    public static function     decodeIDN($name) {
    // split it, parse it and put it back together
    return
    implode(
    ".",
    array_map("IDN::decodePart",explode(".",$name))
    );
    }

    }
    echo     IDN::decodeIDN($_SERVER['HTTP_HOST']);
    ?>
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