recode_string

(PHP 4, PHP 5, PHP 7 < 7.4.0)

recode_string — コード変換指令に基づき文字列のコードを変換する

説明

recode_string(string $request, string $string): string

コード変換指令 request に基づき文字列 string のコードを変換します。

パラメータ

request: 変換指令の型。
string: 変換する文字列。

戻り値

変換後の文字列、または変換指令を実行できない場合に false を返します。

例

例1 基本的な recode_string() の例

<?php
echo recode_string("us..flat", "The following character has a diacritical mark: á");
?>

注意

簡単なコード変換指令は、"lat1..iso646-de" のようになります。

参考

コード変換指令に関する詳細な手順に関しては、インストールされている GNU Recode のドキュメントも参照ください。
mb_convert_encoding() - ある文字エンコーディングの文字列を、別の文字エンコーディングに変換する
UConverter::transcode() - ある文字エンコーディングから別の文字エンコーディングに文字列を変換する
iconv() - ある文字エンコーディングの文字列を、別の文字エンコーディングに変換する

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User Contributed Notes 2 notes

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jazfresh at spam-javelin.hotmail.com ¶

21 years ago

I came across a bug (and workaround) when using recode_string. When converting from utf-8 to iso-2022-jp, it would always return an empty string (although it would work fine for conversions from html to utf8). Converting with recode on the command line worked fine, which was odd. I noticed that if I specified "-v" on the command line, recode stated that it was using libiconv to do the conversion.

Using "iconv" instead of recode got the right results.
i.e.

Works:
$str = recode_string("html..utf-8", "&#26085;&#26412;&#35486;"); // Unicode for "Japanese"

Doesn't work:
$str = recode_string("utf-8..iso-2022-jp", $mystring);

Works:
$str = iconv("utf-8", "iso-2022-jp", $mystring);

Don't ask me why. Hope this saves someone some frustrating hours debugging.

down

bisqwit at iki dot fi ¶

18 years ago

Here's how to convert romaji to katakana/hiragana with PHP (transliterating Japanese text).
The function Romaji2Kana($s) will return with keys 'hira' and 'kata' that respectively contain the hiragana and katakana versions of the given string in UTF-8 encoding.

<?php
// eucjp: 2421; unicode: 3041
define('HIRATABLE', 'a A i I u U e E o O KAGAKIGIKUGUKEGEKOGOSAZASIZISUZUSEZESOZO'.
'TADATIDItuTUDUTEDETODONANINUNENOHABAPAHIBIPIHUBUPUHEBEPEHOBOPO'.
'MAMIMUMEMOyaYAyuYUyoYORARIRUREROwaWAWIWEWOn ');
// eucjp: 2521; unicode: 30A1
define('KATATABLE', 'a A i I u U e E o O KAGAKIGIKUGUKEGEKOGOSAZASIZISUZUSEZESOZO'.
'TADATIDItuTUDUTEDETODONANINUNENOHABAPAHIBIPIHUBUPUHEBEPEHOBOPO'.
'MAMIMUMEMOyaYAyuYUyoYORARIRUREROwaWAWIWEWOn VUkake');

function HiraTrans($s)
{
  #print "trans('$s')\n";
  $pos = strpos(HIRATABLE, $s);
  if($pos===false) return 0xA1BC; // ^
  return 0xA4A1 + $pos/2;
}
function KataTrans($s)
{
  $pos = strpos(KATATABLE, $s);
  if($pos===false) return 0xA1BC; // ^
  return 0xA5A1 + $pos/2;
}

function Romaji2Kana($s)
{
  $s = strtoupper(str_replace(
     Array('shi', 'sh', 'fu', 'chi', 'ch', 'tsu', 'dz', 'l', '-',
           'â', 'î', 'û', 'ê', 'ô', 'ā', 'ī', 'ū', 'ē', 'ō'),
     Array('si',  'sy', 'hu', 'ti',  'ty', 'tu',  'j',  'r', '^',
           'a^', 'i^', 'u^', 'e^', 'o^', 'a^', 'i^', 'u^', 'e^', 'o^'),
     $s));
  // FO -> FUxo
  $s = preg_replace('@F([AIOE])@e', '"HU".strtolower("\1")', $s);
  // VO -> VUxo
  $s = preg_replace('@V([AIUEO])@e', '"VU".strtolower("\1")', $s);
  // KYA -> KYya
  $s = preg_replace('@([KSTNHMRGZBPD])Y([AUO])@e',   '"\1Iy".strtolower("\2")', $s);
  // XTU -> tu (make them actually small)
  $s = preg_replace('@X(TU|Y[AUO]|[AIUEO]|KA|KE)@e', 'strtolower("\1")', $s);
  // KKO -> tuKO
  $s = preg_replace('@([KSTHMRYWGZBPDV]{2,})@e',
                      'str_pad("",2*strlen("\1")-2,"tu").substr("\1",0,1)', $s);
  // N -> n (but not NO -> nO)
  // At this point, N' will work correctly
  $s = preg_replace('@N(?![AIUEO])@', 'n', $s);
  // Unrecognized characters off
  $s = eregi_replace('[^^VAIUEOKSTNHMYRWGZBPD]', '', $s);
  
  $pat = '@([AIUEOnaiueo^]|..)@e';
  $rec = 'EUCJP..UTF8';
  
  return
    Array('hira' => recode_string($rec,preg_replace($pat, 'pack("n", HiraTrans("\1"))', $s)),
          'kata' => recode_string($rec,preg_replace($pat, 'pack("n", KataTrans("\1"))', $s)));
}

print_r( Romaji2Kana('konnichiha') );
?>

Note: Due to technical limitations in the manual pages, there are two errors in this code:
- Some characters in the first str_replace may appear wrong in some php.net mirrors. It supposed to contain aiueo with circumflex and aiueo with macron.
- The strings in the defines should be constant, not appendage expressions. (Line length limitation)

-Joel Yliluoma

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