Last updated: Sat, 24 Mar 2007

LXI. iconv Functions

Úvod

This module contains an interface to iconv character set conversion facility. With this module, you can turn a string represented by a local character set into the one represented by another character set, which may be the Unicode character set. Supported character sets depend on the iconv implementation of your system. Note that the iconv function on some systems may not work as you expect. In such case, it'd be a good idea to install the » GNU libiconv library. It will most likely end up with more consistent results.

Since PHP 5.0.0, this extension comes with various utility functions that help you to write multilingual scripts. Let's have a look at the following sections to explore the new features.

Požadavky

You will need nothing if the system you are using is one of the recent POSIX-compliant systems because standard C libraries that are supplied in them must provide iconv facility. Otherwise, you have to get the » libiconv library installed in your system.

Instalace

To use functions provided by this module, the PHP binary must be built with the following configure line: --with-iconv[=DIR].

Note to Windows® Users: In order to enable this module on a Windows® environment, you need to put a DLL file named iconv.dll or iconv-1.3.dll (prior to 4.2.1) which is bundled with the PHP/Win32 binary package into a directory specified by the PATH environment variable or one of the system directories of your Windows® installation.
This module is part of PHP as of PHP 5 thus iconv.dll and php_iconv.dll is not needed anymore.

Konfigurace běhu

Chování těchto funkcí je ovlivněno nastavením parametrů v php.ini.

Tabulka 106. Iconv configuration options

Name	Default	Changeable	Changelog
iconv.input_encoding	"ISO-8859-1"	PHP_INI_ALL	Available since PHP 4.0.5.
iconv.output_encoding	"ISO-8859-1"	PHP_INI_ALL	Available since PHP 4.0.5.
iconv.internal_encoding	"ISO-8859-1"	PHP_INI_ALL	Available since PHP 4.0.5.

Pro další detaily a definice konstant PHP_INI_*, viz dokumentace k ini_set().

Varování

Some systems (like IBM AIX) use "ISO8859-1" instead of "ISO-8859-1" so this value has to be used in configuration options and function parameters.

Poznámka: Configuration option iconv.input_encoding is currently not used for anything.

Typy prostředků

Toto rozšíření nemá definován žádný typ prostředku (resource).

Předdefinované konstanty

Since PHP 4.3.0 it is possible to identify at runtime which iconv implementation is adopted by this extension.

Tabulka 107. iconv constants

Name	Type	Description
ICONV_IMPL	string	The implementation name
ICONV_VERSION	string	The implementation version

Poznámka: Writing implementation-dependent scripts with these constants is strongly discouraged.

Since PHP 5.0.0, the following constants are also available:

Tabulka 108. iconv constants available since PHP 5.0.0

Name	Type	Description
ICONV_MIME_DECODE_STRICT	integer	A bitmask used for iconv_mime_decode()
ICONV_MIME_DECODE_CONTINUE_ON_ERROR	integer	A bitmask used for iconv_mime_decode()

Viz také

Obsah

iconv_get_encoding — Retrieve internal configuration variables of iconv extension
iconv_mime_decode_headers — Decodes multiple MIME header fields at once
iconv_mime_decode — Decodes a MIME header field
iconv_mime_encode — Composes a MIME header field
iconv_set_encoding — Set current setting for character encoding conversion
iconv_strlen — Returns the character count of string
iconv_strpos — Finds position of first occurrence of a needle within a haystack
iconv_strrpos — Finds the last occurrence of a needle within a haystack
iconv_substr — Cut out part of a string
iconv — Convert string to requested character encoding
ob_iconv_handler — Convert character encoding as output buffer handler

iconv_get_encoding

icap_store_event

Last updated: Sat, 24 Mar 2007

add a note User Contributed Notes
iconv Functions

09-Apr-2007 02:43


Just a little fix for the utf8_to_windows1255 function above. The original function doesn't convert English characters well:



function utf8_to_windows1255($utf8) {

    $windows1255 = "";

    $chars = preg_split("//",$utf8);

    for ($i=1; $i<count($chars)-1; $i++) {

        $prefix = ord($chars[$i]);

        $suffix = ord($chars[$i+1]);

        //print ("<p>$prefix $suffix");

        if ($prefix==215) {

            $windows1255 .= chr($suffix+80);

            $i++;

        }

        elseif ($prefix==214) {

            $windows1255 .= chr($suffix+16);

            $i++;

        }

        else {

            $windows1255 .= $chars[$i];

        }

    }

    return $windows1255;

}

Erel Segal - Rent a Brain
25-Mar-2007 12:32


Note that my mysql_iconv will not translate correctly the Hebrew dotting symbols (Niqqud) - they will be converted into question marks.



Here is a straightforward (and not very efficient) solution:



function utf8_to_windows1255($utf8) {

    $windows1255 = "";

    $chars = preg_split("//",$utf8);

    for ($i=1; $i<count($chars)-1; $i+=2) {

        $prefix = ord($chars[$i]);

        $suffix = ord($chars[$i+1]);

        print ("<p>$prefix $suffix");

        if ($prefix==215)

            $windows1255 .= chr($suffix+80);

        elseif ($prefix==214)

            $windows1255 .= chr($suffix+16);

        else

            $windows1255 .= $chars[$i];

    }

    return $windows1255;

}

Erel Segal - Rent a Brain
09-Dec-2006 03:05


If you don't have iconv, you can use MySQL to do the conversion.



Note that to do this you have to use MySQL's charset names, which are different than iconv names (e.g. "utf8" instead of "utf-8").



<?php

/**

 * @param $string

 * @param $from [string] The name of the current character set of $string, in MySQL format (e.g. "utf8", "hebrew").

 * @param $to [string] The name of the character set to which you want to convert $string.

 * @author Erel Segal - Rent a Brain (http://tora.us.fm/rentabrain)

 * @date 2006-12-10

 */

function mysql_iconv($string, $from, $to) {

    // keep current character set values:

    $character_set_database = mysql_result(mysql_query("SELECT @@character_set_client"),0,0);

    $character_set_results = mysql_result(mysql_query("SELECT @@character_set_results"),0,0);



    mysql_query("SET character_set_client=$from");

    mysql_query("SET character_set_results=$to");



    $string_escaped = mysql_real_escape_string($string);

    $converted_string = mysql_result(mysql_query("SELECT '$string_escaped'"),0,0);



    // restore previous character set values:

    mysql_query("SET character_set_client=$character_set_database");

    mysql_query("SET character_set_results=$character_set_results");



    return $converted_string;

}



?>

Fabian Ketchup
13-Sep-2006 06:00


// Simple file translation.



$FileToconvert = "menu.xml";

$FileConverted = "menu2.xml";



echo "Converting $FileToconvert ...";



file_put_contents($FileConverted, iconv("ISO-8859-1","UTF-8",file_get_contents($FileToconvert))); 



echo "File converted in $FileConverted";

nod at mobi dot kz
17-Jul-2006 07:17


If you need convert string from Windows-1251 to 866. Some characters of 1251 haven't representation on DOS 866. For example, long dash -- chr(150) will be converted to 0, after that iconv finish his work and other charactes  will be skiped. Problem characters range in win1251 (128-159,163,165-167,169,171-174,177-182,187-190).



Use this:



//$text  -  input text in windows-1251

//$cout  -  output text in 866 (cp866, dos ru ascii)



for($i=0;$i<strlen($text);$i++) {

    $ord=ord($text[$i]);

    if($ord>=192&&$ord<=239) $cout.=chr($ord-64);

    elseif($ord>=240&&$ord<=255) $cout.=chr($ord-16);

    elseif($ord==168) $cout.=chr(240);

    elseif($ord==184) $cout.=chr(241);

    elseif($ord==185) $cout.=chr(252);

    elseif($ord==150||$ord==151) $cout.=chr(45);

    elseif($ord==147||$ord==148||$ord==171||$ord==187) $cout.=chr(34);

    elseif($ord>=128&&$ord<=190) $i=$i; //нет представления данному символу

    else $cout.=chr($ord);

}

andrej009
16-Mar-2006 04:22


There's one more special german character: ß (sometimes displayed as Ϋ)



so: case 159: $out .= "ß";break;

08-Nov-2005 12:05


But this is a very slow method to convert this:



// function to change german umlauts into ue, oe, etc.

function cv_input($str){



Better try this:

$tr = array(chr(xyz) => '�', chr(160) => ' '); // Just a simple example, put all your characters in there

$string = strtr($string, $tr);

Christophe Lienert
27-Sep-2005 02:09


In addition to Godfather's note below, you may find this function useful just as well. 



// function to change german umlauts into ue, oe, etc. 

function cv_input($str){

      $out = "";

      for ($i = 0; $i<strlen($str);$i++){

           $ch= ord($str{$i});

           switch($ch){

                case 195: $out .= "";break;     

                case 164: $out .= "ae"; break; 

                case 188: $out .= "ue"; break; 

                case 182: $out .= "oe"; break; 

                case 132: $out .= "Ae"; break; 

                case 156: $out .= "Ue"; break; 

                case 150: $out .= "Oe"; break;

                default : $out .= chr($ch) ;

           }

      }

      return $out;

}

The Godfather
15-Dec-2004 05:36


With this function you can translate the german Symbols from the character set UTF-8 in windows-1252. 



function convert_text($str){

  $out = '';

  for ($i = 0; $i<strlen($str);$i++){

   $ch = ord($str{$i});

   switch($ch){

         case 252: $out .= chr(129);break; //u Umlaut

         case 220: $out .= chr(154);break;//U Umlaut 

         case 228: $out .= chr(132);break;//a Umlaut  

         case 196: $out .= chr(142);break;//A Umlaut 

         case 214: $out .= chr(153);break;//O Umlaut  

         case 246: $out .= chr(148);break;//o Umlaug 

         case 223: $out .= chr(225);break;//SZ 

         default : $out .= chr($ch) ;

   }

  }

  return $out;

}

tokiee at hotmail dot com
19-Aug-2004 01:40


iconv now has been built-in, at least in PHP >= 5.0.1 for win32. You don't have to modify php.ini for this. Actually you should not. And clearly, libiconv does not need to be installed.

thierry.bo
23-Dec-2003 02:26


Windows users.



Personaly I leaved all php dlls in \php\dlls\ directory, just adding this path to my system path, and iconv.dll supplied with php 4.3.2 works fine, also leaving supplied php_iconv.dll in my \php\extensions\ directory. This was working fine with Apache and Omnihttpd server I use.



As soon I installed IIS on the same server, php complained about not finding php_iconv.dll in the extensions directory. In fact PHP with IIS loads all extensions in my \php\extensions directory correctly, except php_iconv.dll. 

Although iconv.dll is in my system path, the only way to load php_iconv.dll was to copy iconv.dll file in \%winnt\system32 directory. With other servers, iconv.dll can be in anywhere in the system path.

ALecFFer
06-Nov-2003 04:10


To windows users:



Download here iconv version 1.9.1:

http://www.zlatkovic.com/pub/libxml/iconv-1.9.1.win32.zip

13-Sep-2002 05:23


I'm not sure how recent version of

glibc 2.x Slackware 7.x/8.x comes with, but

it's very likely that it comes with glibc 2.2.x.

In that case, you don't have to bother at all to

install libiconv in /usr/local. iconv(3) in glibc 2.2.x

is very good (thanks to Ulrich Drepper and

Bruno Haible. the latter is the author of libiconv).

libiconv is very handy for those outdated/non-standard-compliant Unix 

and non-Unix systems that don't have 

sufficiently good iconv(3) in their C library.

elk at NOSPAMmodel-fx dot com
26-Jul-2002 09:07


If you use the libiconv library instead of the libc's iconv support, don't forget to use libiconv() instead of iconv()

elk at NOSPAMmodel-fx dot com
25-Jul-2002 08:39


To compile libiconv under Slackware 7.0 or 8.0 without errors (either with the apache module of PHP or the CGI version), you must specify the full path of the libiconv installation.



Exemple :



       --with-iconv=/usr/local

add a note

iconv_get_encoding

icap_store_event

Last updated: Sat, 24 Mar 2007