PHP failed to download uploaded file from database since uploaded with chinese filename

PHP failed to download uploaded file from database since uploaded with
chinese filename

Excuse me, I am building a web site that can let user upload their
document(pdf) to the mysql database.
Since I have wrote the upload and download php page, I could upload
files(pdf) and download english named files successfully, but fail to
download the files whose name contain chinese words.
More specifically, I can download the chinese named file, but couldn't
open it. It shows that the file is damaged.
Here is a part of code of my upload php page:
$connect = mysqli_connect("localhost", "root", "password", "table");
if(mysqli_connect_errno($connect))//check connection
{
/*show error message and die*/
}
//set client character set to 'utf8'
mysqli_set_charset($connect, "utf8");
$fileName = mysqli_real_escape_string($connect, $name);
$filePath = mysqli_real_escape_string($connect, $tmp_name);
$fileSize = mysqli_real_escape_string($connect, $size);
$fileType = mysqli_real_escape_string($connect, $type);
$content = mysqli_real_escape_string($connect,
file_get_contents($tmp_name));
$filePath = addslashes($filePath);
if(!get_magic_quotes_gpc())
{
$fileName = addslashes($fileName);
}
$teamName = $_COOKIE['teamName'];
$reportQuery = "UPDATE uploadedreport SET name='$fileName',
type='$fileType', size='$fileSize', content='$content' WHERE
team='$teamName'";
uploadFileQuery($connect, $reportQuery, $fileName);
mysqli_close($connect);
Besides, another part of code of download php page is:
$teamName = $_COOKIE['teamName'];
$downloadReportQuery = "SELECT name, type, size, content FROM
uploadedreport WHERE team='$teamName'";
$result = mysqli_query($connect, $downloadReportQuery);
if($result == false)
{
/*alert error message and die*/
}
$row = mysqli_fetch_array($result);
header("Content-length:$row[size]");
header("Content-type:$row[type];charset:UTF-8");
header("Content-Transfer-Encoding: binary");
header("Content-Disposition: attachment; filename=$row[name]");//Tells
the browser to save this downloaded file under the specified name
echo $row["content"];
mysqli_free_result($result);
mysqli_close($connect);
It's there anything wrong? I am disturbed by this problem for several days.
Thanks for your help!
Using Notepad++ to open the damaged downloaded pdf file: little part of
downloaded pdf