| 1 | <?php |
| 2 | |
| 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 | * |
| 9 | * @copyright 2004-2011 The SquirrelMail Project Team |
| 10 | * @license http://opensource.org/licenses/gpl-license.php GNU Public License |
| 11 | * @version $Id$ |
| 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); |
| 27 | |
| 28 | return $string; |
| 29 | } |
| 30 | |
| 31 | /** |
| 32 | * Return us-ascii symbol when unicode character number is provided |
| 33 | * |
| 34 | * This function is used internally by charset_encode_us_ascii |
| 35 | * function. It might be unavailable to other SquirrelMail functions. |
| 36 | * Don't use it or make sure, that functions/encode/us_ascii.php is |
| 37 | * included. |
| 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 | } |