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104 lines
2.8 KiB
PHP
104 lines
2.8 KiB
PHP
<?php
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/////////////////////////////
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// utf8.inc
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// (C)2002 Ryo Chijiiwa <Ryo@IlohaMail.org>
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//
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// Description:
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// UTF-8 handling functions
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//
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// This file is part of IlohaMail. IlohaMail is free software released
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// under the GPL license. See enclosed file COPYING for details, or
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// see http://www.fsf.org/copyleft/gpl.html
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////////////////////////////
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/**
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* takes a string of utf-8 encoded characters and converts it to a string of unicode entities
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* each unicode entitiy has the form &#nnnnn; n={0..9} and can be displayed by utf-8 supporting
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* browsers
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* @param $source string encoded using utf-8 [STRING]
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* @return string of unicode entities [STRING]
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* @access public
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*/
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/**
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* Author: ronen at greyzone dot com
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* Taken from php.net comment:
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* http://www.php.net/manual/en/function.utf8-decode.php
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**/
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function utf8ToUnicodeEntities ($source) {
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// array used to figure what number to decrement from character order value
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// according to number of characters used to map unicode to ascii by utf-8
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$decrement[4] = 240;
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$decrement[3] = 224;
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$decrement[2] = 192;
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$decrement[1] = 0;
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// the number of bits to shift each charNum by
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$shift[1][0] = 0;
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$shift[2][0] = 6;
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$shift[2][1] = 0;
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$shift[3][0] = 12;
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$shift[3][1] = 6;
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$shift[3][2] = 0;
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$shift[4][0] = 18;
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$shift[4][1] = 12;
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$shift[4][2] = 6;
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$shift[4][3] = 0;
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$pos = 0;
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$len = strlen ($source);
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$encodedString = '';
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while ($pos < $len) {
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$asciiPos = ord (substr ($source, $pos, 1));
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if (($asciiPos >= 240) && ($asciiPos <= 255)) {
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// 4 chars representing one unicode character
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$thisLetter = substr ($source, $pos, 4);
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$pos += 4;
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}
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else if (($asciiPos >= 224) && ($asciiPos <= 239)) {
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// 3 chars representing one unicode character
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$thisLetter = substr ($source, $pos, 3);
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$pos += 3;
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}
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else if (($asciiPos >= 192) && ($asciiPos <= 223)) {
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// 2 chars representing one unicode character
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$thisLetter = substr ($source, $pos, 2);
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$pos += 2;
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}
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else {
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// 1 char (lower ascii)
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$thisLetter = substr ($source, $pos, 1);
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$pos += 1;
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}
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// process the string representing the letter to a unicode entity
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$thisLen = strlen ($thisLetter);
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$thisPos = 0;
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$decimalCode = 0;
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while ($thisPos < $thisLen) {
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$thisCharOrd = ord (substr ($thisLetter, $thisPos, 1));
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if ($thisPos == 0) {
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$charNum = intval ($thisCharOrd - $decrement[$thisLen]);
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$decimalCode += ($charNum << $shift[$thisLen][$thisPos]);
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}
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else {
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$charNum = intval ($thisCharOrd - 128);
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$decimalCode += ($charNum << $shift[$thisLen][$thisPos]);
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}
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$thisPos++;
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}
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if ($decimalCode<128)
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$encodedLetter = chr($decimalCode);
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else if ($thisLen == 1)
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$encodedLetter = "&#". str_pad($decimalCode, 3, "0", STR_PAD_LEFT) . ';';
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else
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$encodedLetter = "&#". str_pad($decimalCode, 5, "0", STR_PAD_LEFT) . ';';
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$encodedString .= $encodedLetter;
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}
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return $encodedString;
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}
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?>
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