IDN 函数
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idn_to_ascii

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

idn_to_ascii — Convert domain name to IDNA ASCII form.

说明

过程化风格

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

This function converts Unicode domain name to IDNA ASCII-compatible format.

参数

domain

Domain to convert. In PHP 5 must be UTF-8 encoded.

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 encoded in ASCII-compatible form. 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_ascii() example

<?php

echo idn_to_ascii('t?st.de'); 

?>

以上例程会输出：

xn--tst-qla.de

参见

IDN 函数
在线手册：中文 英文
PHP手册
PHP手册 - N: Convert domain name to IDNA ASCII form.

用户评论:

Eman (11-Nov-2010 12:57)

With PHP 5.3 I started to recieve

Fatal error: Only variables can be passed by reference

when trying to call idn_to_ascii with second optional parameter (IDNA_DEFAULT).
Moreover these IDNA_* constants are seem to be undefined in PHP 5.3. + PECL idn 0.0.2

When I tried to uninstall PECL idn and install PECL intl (1.1.1) i recieved this:

/tmp/pear/temp/intl/collator/collator_class.c:92: error: duplicate ‘static’
/tmp/pear/temp/intl/collator/collator_class.c:96: error: duplicate ‘static’
/tmp/pear/temp/intl/collator/collator_class.c:101: error: duplicate ‘static’
/tmp/pear/temp/intl/collator/collator_class.c:107: error: duplicate ‘static’
make: *** [collator/collator_class.lo] Error 1

So probably compiling PHP 5.3. from sources with --enable-intl will help, but it only means that PHP 5.3. intl version differs from the one available at PECL, which isn't good, I think.

I've made my code working again by giving second idn_to_ascii parameter as simple integer variable (with value 0), but something bad is going on here and i will not be surprised if it'll break again after another PHP update...