| 1 | <?php |
| 2 | /** |
| 3 | * utf-8 encoding functions |
| 4 | * |
| 5 | * takes a string of unicode entities and converts it to a utf-8 encoded string |
| 6 | * each unicode entitiy has the form &#nnn(nn); n={0..9} and can be displayed by utf-8 supporting |
| 7 | * browsers. Ascii will not be modified. |
| 8 | * |
| 9 | * Original code is taken from www.php.net manual comments |
| 10 | * Original author: ronen at greyzone dot com |
| 11 | * |
| 12 | * @version $Id$ |
| 13 | * @copyright Copyright © 2004-2005 The SquirrelMail Project Team |
| 14 | * @package squirrelmail |
| 15 | * @subpackage encode |
| 16 | */ |
| 17 | |
| 18 | /** |
| 19 | * Converts string to utf-8 |
| 20 | * @param string $string text with numeric unicode entities |
| 21 | * @return string utf-8 encoded text |
| 22 | */ |
| 23 | function charset_encode_utf_8 ($string) { |
| 24 | // don't run encoding function, if there is no encoded characters |
| 25 | if (! preg_match("'&#[0-9]+;'",$string) ) return $string; |
| 26 | |
| 27 | $string=preg_replace("/&#([0-9]+);/e","unicodetoutf8('\\1')",$string); |
| 28 | // $string=preg_replace("/&#[xX]([0-9A-F]+);/e","unicodetoutf8(hexdec('\\1'))",$string); |
| 29 | |
| 30 | return $string; |
| 31 | } |
| 32 | |
| 33 | /** |
| 34 | * Return utf8 symbol when unicode character number is provided |
| 35 | * |
| 36 | * This function is used internally by charset_encode_utf_8 |
| 37 | * function. It might be unavailable to other SquirrelMail functions. |
| 38 | * Don't use it or make sure, that functions/encode/utf_8.php is |
| 39 | * included. |
| 40 | * |
| 41 | * @param int $var decimal unicode value |
| 42 | * @return string utf8 character |
| 43 | */ |
| 44 | function unicodetoutf8($var) { |
| 45 | |
| 46 | if ($var < 128) { |
| 47 | $ret = chr ($var); |
| 48 | } else if ($var < 2048) { |
| 49 | // Two byte utf-8 |
| 50 | $binVal = str_pad (decbin ($var), 11, "0", STR_PAD_LEFT); |
| 51 | $binPart1 = substr ($binVal, 0, 5); |
| 52 | $binPart2 = substr ($binVal, 5); |
| 53 | |
| 54 | $char1 = chr (192 + bindec ($binPart1)); |
| 55 | $char2 = chr (128 + bindec ($binPart2)); |
| 56 | $ret = $char1 . $char2; |
| 57 | } else if ($var < 65536) { |
| 58 | // Three byte utf-8 |
| 59 | $binVal = str_pad (decbin ($var), 16, "0", STR_PAD_LEFT); |
| 60 | $binPart1 = substr ($binVal, 0, 4); |
| 61 | $binPart2 = substr ($binVal, 4, 6); |
| 62 | $binPart3 = substr ($binVal, 10); |
| 63 | |
| 64 | $char1 = chr (224 + bindec ($binPart1)); |
| 65 | $char2 = chr (128 + bindec ($binPart2)); |
| 66 | $char3 = chr (128 + bindec ($binPart3)); |
| 67 | $ret = $char1 . $char2 . $char3; |
| 68 | } else if ($var < 2097152) { |
| 69 | // Four byte utf-8 |
| 70 | $binVal = str_pad (decbin ($var), 21, "0", STR_PAD_LEFT); |
| 71 | $binPart1 = substr ($binVal, 0, 3); |
| 72 | $binPart2 = substr ($binVal, 3, 6); |
| 73 | $binPart3 = substr ($binVal, 9, 6); |
| 74 | $binPart4 = substr ($binVal, 15); |
| 75 | |
| 76 | $char1 = chr (240 + bindec ($binPart1)); |
| 77 | $char2 = chr (128 + bindec ($binPart2)); |
| 78 | $char3 = chr (128 + bindec ($binPart3)); |
| 79 | $char4 = chr (128 + bindec ($binPart4)); |
| 80 | $ret = $char1 . $char2 . $char3 . $char4; |
| 81 | } else if ($var < 67108864) { |
| 82 | // Five byte utf-8 |
| 83 | $binVal = str_pad (decbin ($var), 26, "0", STR_PAD_LEFT); |
| 84 | $binPart1 = substr ($binVal, 0, 2); |
| 85 | $binPart2 = substr ($binVal, 2, 6); |
| 86 | $binPart3 = substr ($binVal, 8, 6); |
| 87 | $binPart4 = substr ($binVal, 14,6); |
| 88 | $binPart5 = substr ($binVal, 20); |
| 89 | |
| 90 | $char1 = chr (248 + bindec ($binPart1)); |
| 91 | $char2 = chr (128 + bindec ($binPart2)); |
| 92 | $char3 = chr (128 + bindec ($binPart3)); |
| 93 | $char4 = chr (128 + bindec ($binPart4)); |
| 94 | $char5 = chr (128 + bindec ($binPart5)); |
| 95 | $ret = $char1 . $char2 . $char3 . $char4 . $char5; |
| 96 | } else if ($var < 2147483648) { |
| 97 | // Six byte utf-8 |
| 98 | $binVal = str_pad (decbin ($var), 31, "0", STR_PAD_LEFT); |
| 99 | $binPart1 = substr ($binVal, 0, 1); |
| 100 | $binPart2 = substr ($binVal, 1, 6); |
| 101 | $binPart3 = substr ($binVal, 7, 6); |
| 102 | $binPart4 = substr ($binVal, 13,6); |
| 103 | $binPart5 = substr ($binVal, 19,6); |
| 104 | $binPart6 = substr ($binVal, 25); |
| 105 | |
| 106 | $char1 = chr (252 + bindec ($binPart1)); |
| 107 | $char2 = chr (128 + bindec ($binPart2)); |
| 108 | $char3 = chr (128 + bindec ($binPart3)); |
| 109 | $char4 = chr (128 + bindec ($binPart4)); |
| 110 | $char5 = chr (128 + bindec ($binPart5)); |
| 111 | $char6 = chr (128 + bindec ($binPart6)); |
| 112 | $ret = $char1 . $char2 . $char3 . $char4 . $char5 . $char6; |
| 113 | } else { |
| 114 | // there is no such symbol in utf-8 |
| 115 | $ret='?'; |
| 116 | } |
| 117 | return $ret; |
| 118 | } |
| 119 | ?> |