汉字转换成Unicode编码PHP程序

//将utf8编码的汉字转换为unicode
function htou($c){
 $n = (ord($c[0]) & 0x1f) << 12;
 $n = (ord($c[1]) & 0x3f) << 6;
 $n = ord($c[2]) & 0x3f;
 return $n;
}

//在代码中隐藏utf8格式的字符串
function my_utf8_unicode($str) {
 $encode='';
 for($i=0;$i   if(ord(substr($str,$i,1))> 0xa0){
   $encode.='&#'.htou(substr($str,$i,3)).';';
   $i =2;
  }else{
   $encode.='&#'.ord($str[$i]).';';
  }
 }
 return $encode;
}

echo my_utf8_unicode("哈哈ABC");
?>

function getUnicode($word)
{
 // 转UTF8
 $word0 = iconv('gbk', 'utf-8', $word);
 $word1 = iconv('utf-8', 'gbk', $word0);
 $word =  ($word1 == $word) ? $word0 : $word;
 // 拆分汉字
 preg_match_all('#(?:[x00-x7F]|[xC0-xFF][x80-xBF]+)#s', $word, $array, PREG_PATTERN_ORDER);
 $return  = array();
 // 转换
 foreach ($array[0] as $cc)
 {
  $arr = str_split($cc);
  $bin_str = '';
  foreach ($arr as $value)
  {
   $bin_str .= decbin(ord($value));
  }
  $bin_str = preg_replace('/^.{4}(.{4}).{2}(.{6}).{2}(.{6})$/','$1$2$3', $bin_str);
  $return[] = '&#' . bindec($bin_str) . ';';
 }
 
 return implode('', $return);
}

$word = '一个汉字转换成Ｕｎｉｃｏｄｅ四字节编码的PHP函数。';
echo getUnicode($word);

function uni_encode ($word)
{
 $word0 = iconv('gbk', 'utf-8', $word);
 $word1 = iconv('utf-8', 'gbk', $word0);
 $word =  ($word1 == $word) ? $word0 : $word;
    $word = json_encode($word);
    $word = preg_replace_callback('/\\u(w{4})/', create_function('$hex', 'return '&#'.hexdec($hex[1]).';';'), substr($word, 1, strlen($word)-2));
    return $word;
}

function uni_decode ($uncode)
{
    $word = json_decode(preg_replace_callback('/&#(d{5});/', create_function('$dec', 'return '\u'.dechex($dec[1]);'), '"'.$uncode.'"'));
    return $word;
}