Download PDF from FTP server, and save directly to client machine - PHP

Question

I’ve been trying to solve this problem for a few days!

I need to download some pdf’s that are on the FTP server right in the client’s browser, but when I do this by forcing headers, the file even downloads but corrupted "Failed to load PDF document."

Follow the code below:

$ftp_arquivo = "path/arquivo.pdf";
$ftp_host = "ftp.exemplo.com.br";
$ftp_port = "21";
$ftp_username = "usuario";
$ftp_senha = "senha";


ob_start();

$fcon = ftp_connect($ftp_host);
$conecta = ftp_login($fcon, $ftp_username, $ftp_senha);
ftp_pasv($fcon, true);

$arquivo = basename($ftp_arquivo);

ftp_get($fcon, $arquivo, $arquivo, FTP_BINARY); 

ftp_close($fcon);


$file = $arquivo;

$size = filesize($arquivo);

header("Content-Description: File Transfer");
header("Content-type:application/octet-stream");
header("Content-Length: {$size}");
header("Content-Disposition: attachment; filename=\"" . $file . "\"");
header('Content-Transfer-Encoding: binary');
header('Expires: 0');
header('Cache-Control: must-revalidate, post-check=0, pre-check=0');
header('Pragma: public');

ob_clean();
flush();