50 lines
1.3 KiB
PHP
50 lines
1.3 KiB
PHP
<?php
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/**
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* us_ascii encoding functions
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*
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* takes a string of unicode entities and converts it to a us-ascii encoded string
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* Unsupported characters are replaced with ?.
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*
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* @copyright 2004-2025 The SquirrelMail Project Team
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* @license http://opensource.org/licenses/gpl-license.php GNU Public License
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* @version $Id$
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* @package squirrelmail
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* @subpackage encode
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*/
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/**
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* Converts string to us-ascii
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* @param string $string text with numeric unicode entities
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* @return string us-ascii encoded text
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*/
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function charset_encode_us_ascii ($string) {
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// don't run encoding function, if there is no encoded characters
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if (! preg_match("'&#[0-9]+;'",$string) ) return $string;
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$string=preg_replace_callback("/&#([0-9]+);/",'unicodetousascii',$string);
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return $string;
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}
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/**
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* Return us-ascii symbol when unicode character number is provided
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*
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* This function is used internally by charset_encode_us_ascii
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* function. It might be unavailable to other SquirrelMail functions.
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* Don't use it or make sure, that functions/encode/us_ascii.php is
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* included.
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*
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* @param array $matches array with first element a decimal unicode value
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* @return string us-ascii character
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*/
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function unicodetousascii($matches) {
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$var = $matches[1];
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if ($var < 128) {
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$ret = chr ($var);
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} else {
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$ret='?';
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}
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return $ret;
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}
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