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1 lars 1 
<?php
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// $Header: /cvsroot/html2ps/encoding.inc.php,v 1.7 2006/06/25 13:55:36 Konstantin Exp $
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/**
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 * Converts a hexadecimal string  representing UCS-2 character code to
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 * UTF-8 encoding
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 */
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function hex_to_utf8($code) {
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  return code_to_utf8(hexdec($code));
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}
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/**
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 * Converts an UTF8-encoded character to UCS-2 integer code
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 * TODO: handle sequence incorrect length
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 */
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function utf8_to_code($utf8) {
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  $code = 0;
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  if ((ord($utf8{0}) & 0xF0) == 0xF0) {
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    // 4-byte sequence
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    $code =
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      ((ord($utf8{0}) & 0x07) << 18) |
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      ((ord($utf8{1}) & 0x3F) << 12) |
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      ((ord($utf8{2}) & 0x3F) <<  6) |
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      (ord($utf8{3}) & 0x3F);
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  } elseif ((ord($utf8{0}) & 0xE0) === 0xE0) {
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    // 3-byte sequence
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    $code =
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      ((ord($utf8{0}) & 0x0F) << 12) |
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      ((ord($utf8{1}) & 0x3F) <<  6) |
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      (ord($utf8{2}) & 0x3F);
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  } elseif ((ord($utf8{0}) & 0xC0) === 0xC0) {
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    // 2-byte sequence
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    $code =
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      ((ord($utf8{0}) & 0x1F) << 6) |
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      (ord($utf8{1}) & 0x3F);
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  } else {
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    // Single-byte sequence
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    $code = ord($utf8);
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  };
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  return $code;
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}
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/**
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 * Converts an integer UCS-2 character code to UTF-8 encoding
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 */
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function code_to_utf8($code) {
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  if ($code < 128) {
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    return chr($code);
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  };
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  if ($code < 2048) {
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    return chr(0xC0 | (($code >> 6) & 0x1F)) . chr(0x80 | ($code & 0x3F));
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  };
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  if ($code < 65536) {
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    return chr(0xE0 | (($code >> 12) & 0x0F)) . chr(0x80 | (($code >> 6) & 0x3F)) . chr(0x80 | ($code & 0x3F));
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  };
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  return
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    chr(0xF0 | (($code >> 18) & 0x07)) .
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    chr(0x80 | (($code >> 12) & 0x3F)) .
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    chr(0x80 | (($code >>  6) & 0x3F)) .
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    chr(0x80 | ($code & 0x3F));
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}
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?>