Php file upload doesn't work

Hello,

I have a large blob field in a Mysql table.

When upload a file with phpmyadmin into this field, it works fine.

But when i use the script below to upload, the file is broken when downloading.
I tested with small and big files too.

Upload script :
$tmpName = $_FILES["file"]["tmp_name"];
$fileName = $_FILES["file"]["name"];
$fileType = $_FILES["file"]["type"];
$fileSize = $_FILES["file"]["size"];
$fp      = fopen($tmpName, 'r');
$content = fread($fp, filesize($tmpName));
$content = addslashes($content);
fclose($fp);
$insert = "INSERT INTO bizt_fileok (ajanlat_id, file_name, file_size, file_type, content)  VALUES ('$maxId', '$fileName', '$fileSize', '$fileType', '$content')";

Database Structure: id (int 11 auto_inc), ajanlat_id (int 11),  file_name(varchar45), file_size (int 11), file_type (varchar45), content (longblob).

Download script:
header('Content-Type: '.$file["file_type"].'');
header('Content-Disposition: attachment; filename="'.$file["file_name"].'"');
echo $file["content"];

The script above worked a few weeks ago and then it stopped working properly.
Can it be a server side problem or my code is bad?

Thank you