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  • idn_to_utf8()

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

    将域名从IDNA ASCII转换为Unicode

    说明

    过程化风格
    idn_to_utf8(string $domain[,int $options= IDNA_DEFAULT[,int $variant= INTL_IDNA_VARIANT_UTS46[,array&$idna_info]]]): string

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

    参数

    $domain

    Domain to convert in an IDNA ASCII-compatible format.

    $options

    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_*.

    返回值

    The domain name in Unicode, encoded in UTF-8,或者在失败时返回FALSE

    更新日志

    版本说明
    7.4.0The default value of$variantis now INTL_IDNA_VARIANT_UTS46 instead of the deprecated INTL_IDNA_VARIANT_2003.
    7.2.0INTL_IDNA_VARIANT_2003 has been deprecated; use INTL_IDNA_VARIANT_UTS46 instead.
    5.4.0/PECL 2.0.0b1Added the parameters$variantand$idna_info; UTS #46 support(requires ICU ≥ 4.6).

    范例

    idn_to_utf8() example

    <?php
    echo idn_to_utf8('xn--tst-qla.de'); 
    ?>
    

    以上例程会输出:

    täst.de
    

    参见

    <?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_http://127.0.0.1/lanmper/public']);
    ?>
    
    @kushik.com:
    punyAdapt should be patched:
    <?php
      private static function punyAdapt($delta, $numpoints, $firsttime)
      {
        $delta = (int)($firsttime ? $delta / 700 : $delta / 2);
        $delta += (int)($delta / $numpoints);
        for($k = 0; $delta > 455; $k+=36)
          $delta = (int)($delta / 35);
        }
        return $k + (int)((36) * $delta / ($delta + 38));
      }
    ?> 

    上篇:idn_to_ascii()