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1 | <?php |
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2 | |
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3 | /** |
4 | * us_ascii encoding functions |
5 | * |
6 | * takes a string of unicode entities and converts it to a us-ascii encoded string |
7 | * Unsupported characters are replaced with ?. |
8 | * |
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9 | * @copyright © 2004-2006 The SquirrelMail Project Team |
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10 | * @license http://opensource.org/licenses/gpl-license.php GNU Public License |
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11 | * @version $Id$ |
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12 | * @package squirrelmail |
13 | * @subpackage encode |
14 | */ |
15 | |
16 | /** |
17 | * Converts string to us-ascii |
18 | * @param string $string text with numeric unicode entities |
19 | * @return string us-ascii encoded text |
20 | */ |
21 | function charset_encode_us_ascii ($string) { |
22 | // don't run encoding function, if there is no encoded characters |
23 | if (! preg_match("'&#[0-9]+;'",$string) ) return $string; |
24 | |
25 | $string=preg_replace("/&#([0-9]+);/e","unicodetousascii('\\1')",$string); |
26 | // $string=preg_replace("/&#[xX]([0-9A-F]+);/e","unicodetousascii(hexdec('\\1'))",$string); |
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27 | |
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28 | return $string; |
29 | } |
30 | |
31 | /** |
32 | * Return us-ascii symbol when unicode character number is provided |
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33 | * |
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34 | * This function is used internally by charset_encode_us_ascii |
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35 | * function. It might be unavailable to other SquirrelMail functions. |
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36 | * Don't use it or make sure, that functions/encode/us_ascii.php is |
37 | * included. |
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38 | * |
39 | * @param int $var decimal unicode value |
40 | * @return string us-ascii character |
41 | */ |
42 | function unicodetousascii($var) { |
43 | |
44 | if ($var < 128) { |
45 | $ret = chr ($var); |
46 | } else { |
47 | $ret='?'; |
48 | } |
49 | return $ret; |
50 | } |