Web студия "GrandView"

Description

string mb_detect_encoding ( string str [, mixed encoding_list [, bool strict]] )

mb_detect_encoding() detects character encoding in string str. It returns detected character encoding.

encoding_list is list of character encoding. Encoding order may be specified by array or comma separated list string.

If encoding_list is omitted, detect_order is used.

strict specifies whether to use the strict encoding detection or not. Default is FALSE.

Пример 1. mb_detect_encoding() example

<?php /* Detect character encoding with current detect_order */ echo mb_detect_encoding($str); /* "auto" is expanded to "ASCII,JIS,UTF-8,EUC-JP,SJIS" */ echo mb_detect_encoding($str, "auto"); /* Specify encoding_list character encoding by comma separated list */ echo mb_detect_encoding($str, "JIS, eucjp-win, sjis-win"); /* Use array to specify encoding_list */ $ary[] = "ASCII"; $ary[] = "JIS"; $ary[] = "EUC-JP"; echo mb_detect_encoding($str, $ary); ?>

See also mb_detect_order().

add a note User Contributed Notes
mb_detect_encoding

mark at kinoko dot fr
12-Oct-2007 07:56


For: rl at itfigures dot nl



Just note that your Euro symbol being \x80 is NOT standard for ISO-8859-1 or ISO-8859-15 as \x80 is a reserved character.



It is however "common practice" for windows developpers to mix windows-1252 and ISO-8859-1. Just convert to windows-1252 instead of ISO-8859-1 and you'll get your € symbol at the right place.

rl at itfigures dot nl
04-Sep-2007 02:00


I used Chris's function "detectUTF8" to detect the need from conversion from utf8 to 8859-1, which works fine. I did have a problem with the following iconv-conversion.



The problem is that the iconv-conversion to 8859-1 (with //TRANSLIT) replaces the euro-sign with EUR, although it is common practice  that \x80 is used as the euro-sign in the 8859-1 charset. 



I could not use 8859-15 since that mangled some other characters, so I added 2 str_replace's:



if(detectUTF8($str)){

  $str=str_replace("\xE2\x82\xAC","&euro;",$str); 

  $str=iconv("UTF-8","ISO-8859-1//TRANSLIT",$str);

  $str=str_replace("&euro;","\x80",$str); 

}



If html-output is needed the last line is not necessary (and even unwanted).

sunggsun
15-Aug-2006 12:26


from PHPDIG



    function isUTF8($str) {

        if ($str === mb_convert_encoding(mb_convert_encoding($str, "UTF-32", "UTF-8"), "UTF-8", "UTF-32")) {

            return true;

        } else {

            return false;

        }

    }

chris AT w3style.co DOT uk
03-Aug-2006 02:22


Based upon that snippet below using preg_match() I needed something faster and less specific.  That function works and is brilliant but it scans the entire strings and checks that it conforms to UTF-8.  I wanted something purely to check if a string contains UTF-8 characters so that I could switch character encoding from iso-8859-1 to utf-8.



I modified the pattern to only look for non-ascii multibyte sequences in the UTF-8 range and also to stop once it finds at least one multibytes string.  This is quite a lot faster.



<?php



function detectUTF8($string)

{

        return preg_match('%(?:

        [\xC2-\xDF][\x80-\xBF]        # non-overlong 2-byte

        |\xE0[\xA0-\xBF][\x80-\xBF]               # excluding overlongs

        |[\xE1-\xEC\xEE\xEF][\x80-\xBF]{2}      # straight 3-byte

        |\xED[\x80-\x9F][\x80-\xBF]               # excluding surrogates

        |\xF0[\x90-\xBF][\x80-\xBF]{2}    # planes 1-3

        |[\xF1-\xF3][\x80-\xBF]{3}                  # planes 4-15

        |\xF4[\x80-\x8F][\x80-\xBF]{2}    # plane 16

        )+%xs', $string);

}



?>

telemach
27-Jul-2005 06:48


beware : even if you need to distinguish between UTF-8 and ISO-8859-1, and you the following detection order (as chrigu suggests)



mb_detect_encoding('accentu