functions/encode/us_ascii.php

   1 <?php
   2 /**
   3  * us_ascii encoding functions
   4  *
   5  * takes a string of unicode entities and converts it to a us-ascii encoded string
   6  * Unsupported characters are replaced with ?.
   7  *
   8  * @version $Id$
   9  * @copyright Copyright &copy; 2004-2005 The SquirrelMail Project Team
  10  * @package squirrelmail
  11  * @subpackage encode
  12  */
  13
  14 /**
  15  * Converts string to us-ascii
  16  * @param string $string text with numeric unicode entities
  17  * @return string us-ascii encoded text
  18  */
  19 function charset_encode_us_ascii ($string) {
  20    // don't run encoding function, if there is no encoded characters
  21    if (! preg_match("'&#[0-9]+;'",$string) ) return $string;
  22
  23     $string=preg_replace("/&#([0-9]+);/e","unicodetousascii('\\1')",$string);
  24     // $string=preg_replace("/&#[xX]([0-9A-F]+);/e","unicodetousascii(hexdec('\\1'))",$string);
  25
  26     return $string;
  27 }
  28
  29 /**
  30  * Return us-ascii symbol when unicode character number is provided
  31  *
  32  * This function is used internally by charset_encode_us_ascii
  33  * function. It might be unavailable to other squirrelmail functions.
  34  * Don't use it or make sure, that functions/encode/us_ascii.php is
  35  * included.
  36  *
  37  * @param int $var decimal unicode value
  38  * @return string us-ascii character
  39  */
  40 function unicodetousascii($var) {
  41
  42     if ($var < 128) {
  43         $ret = chr ($var);
  44     } else {
  45         $ret='?';
  46     }
  47     return $ret;
  48 }
  49 ?>