Php prepared statement upload file

$query = "INSERT INTO contracts(`filename`,`filedata`, `filetype`,`filesize`) VALUES (?,?,?,?)";
$stmt = $con->prepare($query);
$null = NULL;
$stmt->bind_param("sbsi", $filename, $filedata, $filetype,$filesize);
$stmt->send_long_data(1, file_get_contents($_FILES['upload']['tmp_name'])); 
$stmt->execute();

Source: stackoverflow.com

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