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 orINTL_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 |
---|---|
7.4.0 | The default value of$variantis now INTL_IDNA_VARIANT_UTS46 instead of the deprecated INTL_IDNA_VARIANT_2003 . |
7.2.0 | INTL_IDNA_VARIANT_2003 has been deprecated; use INTL_IDNA_VARIANT_UTS46 instead. |
5.4.0/PECL 2.0.0b1 | Added the parameters$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
idn_to_ascii()
Convert domain name to IDNA ASCII form
<?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));
}
?>