PC Professionell 2004 December/PCpro_2004_12.ISO/files/webserver/tsw/TSW_3.4.0.exe/Apache2/admin/utf8.inc

Text File | 2003-03-16 | 2.8 KB | 102 lines

<?php
/////////////////////////////
//    utf8.inc
//    (C)2002 Ryo Chijiiwa <[e-mail]>
//
//        Description:
//                UTF-8 handling functions
//
//    This file is part of IlohaMail. IlohaMail is free software released
//    under the GPL license.  See enclosed file COPYING for details, or
//    see http://www.fsf.org/copyleft/gpl.html
////////////////////////////

/**
* takes a string of utf-8 encoded characters and converts it to a string of unicode entities
* each unicode entitiy has the form &#nnnnn; n={0..9} and can be displayed by utf-8 supporting
* browsers
* @param $source string encoded using utf-8 [STRING]
* @return string of unicode entities [STRING]
* @access public
*/
/**
* Author: ronen at greyzone dot com
* Taken from php.net comment:
*    http://www.php.net/manual/en/function.utf8-decode.php
**/
function utf8ToUnicodeEntities ($source) {
    // array used to figure what number to decrement from character order value
    // according to number of characters used to map unicode to ascii by utf-8
    $decrement[4] = 240;
    $decrement[3] = 224;
    $decrement[2] = 192;
    $decrement[1] = 0;

    // the number of bits to shift each charNum by
    $shift[1][0] = 0;
    $shift[2][0] = 6;
    $shift[2][1] = 0;
    $shift[3][0] = 12;
    $shift[3][1] = 6;
    $shift[3][2] = 0;
    $shift[4][0] = 18;
    $shift[4][1] = 12;
    $shift[4][2] = 6;
    $shift[4][3] = 0;

    $pos = 0;
    $len = strlen ($source);
    $encodedString = '';
    while ($pos < $len) {
        $asciiPos = ord (substr ($source, $pos, 1));
        if (($asciiPos >= 240) && ($asciiPos <= 255)) {
            // 4 chars representing one unicode character
            $thisLetter = substr ($source, $pos, 4);
            $pos += 4;
        }
        else if (($asciiPos >= 224) && ($asciiPos <= 239)) {
            // 3 chars representing one unicode character
            $thisLetter = substr ($source, $pos, 3);
            $pos += 3;
        }
        else if (($asciiPos >= 192) && ($asciiPos <= 223)) {
            // 2 chars representing one unicode character
            $thisLetter = substr ($source, $pos, 2);
            $pos += 2;
        }
        else {
            // 1 char (lower ascii)
            $thisLetter = substr ($source, $pos, 1);
            $pos += 1;
        }

        // process the string representing the letter to a unicode entity
        $thisLen = strlen ($thisLetter);
        $thisPos = 0;
        $decimalCode = 0;
        while ($thisPos < $thisLen) {
            $thisCharOrd = ord (substr ($thisLetter, $thisPos, 1));
            if ($thisPos == 0) {
                $charNum = intval ($thisCharOrd - $decrement[$thisLen]);
                $decimalCode += ($charNum << $shift[$thisLen][$thisPos]);
            }
            else {
                $charNum = intval ($thisCharOrd - 128);
                $decimalCode += ($charNum << $shift[$thisLen][$thisPos]);
            }

            $thisPos++;
        }

        if ($thisLen == 1)
            $encodedLetter = "&#". str_pad($decimalCode, 3, "0", STR_PAD_LEFT) . ';';
        else
            $encodedLetter = "&#". str_pad($decimalCode, 5, "0", STR_PAD_LEFT) . ';';

        $encodedString .= $encodedLetter;
    }

    return $encodedString;
}

?>