unicode和中文字符的互相转换

//中文转unicode
function unicode_encode($name)
{
  $name = iconv('UTF-8', 'UCS-2', $name);
  $len = strlen($name);
  $str = '';
  for ($i = 0; $i < $len - 1; $i = $i + 2)
  {
    $c = $name[$i];
    $c2 = $name[$i + 1];
    if (ord($c) > 0)
    {  // 两个字节的文字
      $str .= '\u'.base_convert(ord($c), 10, 16).base_convert(ord($c2), 10, 16);
    }
    else
    {
      $str .= $c2;
    }
  }
  return $str;
}
$str = "新浪微博";

echo 'unicode转中文：'.unicode_encode($str);

//unicode转中文

function unicode_decode($name)
{
  // 转换编码，将Unicode编码转换成可以浏览的utf-8编码
  $pattern = '/([\w]+)|(\\\u([\w]{4}))/i';
  preg_match_all($pattern, $name, $matches);
  if (!empty($matches))
  {
    $name = '';
    for ($j = 0; $j < count($matches[0]); $j++)
    {
      $str = $matches[0][$j];
      if (strpos($str, '\\u') === 0)
      {
        $code = base_convert(substr($str, 2, 2), 16, 10);
        $code2 = base_convert(substr($str, 4), 16, 10);
        $c = chr($code).chr($code2);
        $c = iconv('UCS-2', 'UTF-8', $c);
        $name .= $c;
      }
      else
      {
        $name .= $str;
      }
    }
  }
  return $name;
}

$str2= '\u65b0\u6d6a\u5fae\u535a';

echo "
unicode转中文：".unicode_decode($str2);
?>

打印出来是如下的样式：