Viewing file:  utf_8.php (4.29 KB) -rw-r--r--
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<?php
/**
* utf-8 encoding functions
*
* takes a string of unicode entities and converts it to a utf-8 encoded string
* each unicode entitiy has the form &#nnn(nn); n={0..9} and can be displayed by utf-8 supporting
* browsers. Ascii will not be modified.
*
* Original code is taken from www.php.net manual comments
* Original author: ronen at greyzone dot com
*
* @copyright 2004-2010 The SquirrelMail Project Team
* @license http://opensource.org/licenses/gpl-license.php GNU Public License
* @version $Id: utf_8.php 13893 2010-01-25 02:47:41Z pdontthink $
* @package squirrelmail
* @subpackage encode
*/
/**
* Converts string to utf-8
* @param string $string text with numeric unicode entities
* @return string utf-8 encoded text
*/
function charset_encode_utf_8 ($string) {
// don't run encoding function, if there is no encoded characters
if (! preg_match("'&#[0-9]+;'",$string) ) return $string;
$string=preg_replace("/&#([0-9]+);/e","unicodetoutf8('\\1')",$string);
// $string=preg_replace("/&#[xX]([0-9A-F]+);/e","unicodetoutf8(hexdec('\\1'))",$string);
return $string;
}
/**
* Return utf8 symbol when unicode character number is provided
*
* This function is used internally by charset_encode_utf_8
* function. It might be unavailable to other SquirrelMail functions.
* Don't use it or make sure, that functions/encode/utf_8.php is
* included.
*
* @param int $var decimal unicode value
* @return string utf8 character
*/
function unicodetoutf8($var) {
if ($var < 128) {
$ret = chr ($var);
} else if ($var < 2048) {
// Two byte utf-8
$binVal = str_pad (decbin ($var), 11, "0", STR_PAD_LEFT);
$binPart1 = substr ($binVal, 0, 5);
$binPart2 = substr ($binVal, 5);
$char1 = chr (192 + bindec ($binPart1));
$char2 = chr (128 + bindec ($binPart2));
$ret = $char1 . $char2;
} else if ($var < 65536) {
// Three byte utf-8
$binVal = str_pad (decbin ($var), 16, "0", STR_PAD_LEFT);
$binPart1 = substr ($binVal, 0, 4);
$binPart2 = substr ($binVal, 4, 6);
$binPart3 = substr ($binVal, 10);
$char1 = chr (224 + bindec ($binPart1));
$char2 = chr (128 + bindec ($binPart2));
$char3 = chr (128 + bindec ($binPart3));
$ret = $char1 . $char2 . $char3;
} else if ($var < 2097152) {
// Four byte utf-8
$binVal = str_pad (decbin ($var), 21, "0", STR_PAD_LEFT);
$binPart1 = substr ($binVal, 0, 3);
$binPart2 = substr ($binVal, 3, 6);
$binPart3 = substr ($binVal, 9, 6);
$binPart4 = substr ($binVal, 15);
$char1 = chr (240 + bindec ($binPart1));
$char2 = chr (128 + bindec ($binPart2));
$char3 = chr (128 + bindec ($binPart3));
$char4 = chr (128 + bindec ($binPart4));
$ret = $char1 . $char2 . $char3 . $char4;
} else if ($var < 67108864) {
// Five byte utf-8
$binVal = str_pad (decbin ($var), 26, "0", STR_PAD_LEFT);
$binPart1 = substr ($binVal, 0, 2);
$binPart2 = substr ($binVal, 2, 6);
$binPart3 = substr ($binVal, 8, 6);
$binPart4 = substr ($binVal, 14,6);
$binPart5 = substr ($binVal, 20);
$char1 = chr (248 + bindec ($binPart1));
$char2 = chr (128 + bindec ($binPart2));
$char3 = chr (128 + bindec ($binPart3));
$char4 = chr (128 + bindec ($binPart4));
$char5 = chr (128 + bindec ($binPart5));
$ret = $char1 . $char2 . $char3 . $char4 . $char5;
} else if ($var < 2147483648) {
// Six byte utf-8
$binVal = str_pad (decbin ($var), 31, "0", STR_PAD_LEFT);
$binPart1 = substr ($binVal, 0, 1);
$binPart2 = substr ($binVal, 1, 6);
$binPart3 = substr ($binVal, 7, 6);
$binPart4 = substr ($binVal, 13,6);
$binPart5 = substr ($binVal, 19,6);
$binPart6 = substr ($binVal, 25);
$char1 = chr (252 + bindec ($binPart1));
$char2 = chr (128 + bindec ($binPart2));
$char3 = chr (128 + bindec ($binPart3));
$char4 = chr (128 + bindec ($binPart4));
$char5 = chr (128 + bindec ($binPart5));
$char6 = chr (128 + bindec ($binPart6));
$ret = $char1 . $char2 . $char3 . $char4 . $char5 . $char6;
} else {
// there is no such symbol in utf-8
$ret='?';
}
return $ret;
}
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