IDN 函数
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idn_to_utf8

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

idn_to_utf8Convert domain name from IDNA ASCII to Unicode.

说明

过程化风格

string idn_to_utf8 ( string $domain [, int $options = 0 [, int $variant = INTL_IDNA_VARIANT_2003 [, array &$idna_info ]]] )

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

参数

domain

Domain to convert in IDNA ASCII-compatible format.

options

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

variant

Either INTL_IDNA_VARIANT_2003 for IDNA 2003 or INTL_IDNA_VARIANT_UTS46 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

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
5.4.0/PECL 2.0.0b1 Added the parameters variant and idna_info; UTS #46 support.

范例

Example #1 idn_to_utf8() example

<?php

echo idn_to_utf8('xn--tst-qla.de'); 

?>

以上例程会输出:

t?st.de

参见


IDN 函数
在线手册:中文  英文

用户评论:

zedwood.com (2013-06-20 20:29:54)

@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));
    }
?>

kushik.com (2013-05-02 13:36:18)

<?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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