<?php
/**
* iso-8859-1 encoding functions
*
* takes a string of unicode entities and converts it to a iso-8859-1 encoded string
* Unsupported characters are replaced with ?.
*
* @copyright 2004-2011 The SquirrelMail Project Team
* @license http://opensource.org/licenses/gpl-license.php GNU Public License
* @version $Id: iso_8859_1.php 14084 2011-01-06 02:44:03Z pdontthink $
* @package squirrelmail
* @subpackage encode
*/
/**
* Converts string to iso-8859-1
* @param string $string text with numeric unicode entities
* @return string iso-8859-1 encoded text
*/
function charset_encode_iso_8859_1 ($string) {
// don't run encoding function, if there is no encoded characters
if (! preg_match("'&#[0-9]+;'",$string) ) return $string;
$string=preg_replace("/&#([0-9]+);/e","unicodetoiso88591('\\1')",$string);
// $string=preg_replace("/&#[xX]([0-9A-F]+);/e","unicodetoiso88591(hexdec('\\1'))",$string);
return $string;
}
/**
* Return iso-8859-1 symbol when unicode character number is provided
*
* This function is used internally by charset_encode_iso_8859_1
* function. It might be unavailable to other SquirrelMail functions.
* Don't use it or make sure, that functions/encode/iso_8859_1.php is
* included.
*
* @param int $var decimal unicode value
* @return string iso-8859-1 character
*/
function unicodetoiso88591($var) {
if ($var < 256) {
$ret = chr ($var);
} else {
$ret='?';
}
return $ret;
}
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