php file transfer from one server to another - php

Question

I need to transfer a file from server1 to server2 using html-php. Right now from server1 the download file works fine with following php code, but instead of downloading to client machine, I need this file file to upload to another server, how can I do this.
Note that the file is not in web directory, I have to read the file from no web directory and transfer to server2.
header('Content-Description: File Transfer');
header('Content-Type: application/octet-stream');
header('Content-Disposition: attachment; filename="'.basename($filepath).'"');
header('Expires: 0');
header('Cache-Control: must-revalidate');
header('Pragma: public');
header('Content-Length: ' . filesize($filepath));
flush(); // Flush system output buffer
readfile("/home/user/file.ini");

Answer 1

Method 1: Serve File to Download
Server 1
$file_name = 'usb.zip';
$file = '/usr/download/' . $file_name;
if (file_exists($file))
{
if(false !== ($handler = fopen($file, 'r')))
{
header('Content-Description: File Transfer');
header('Content-Type: application/octet-stream');
header('Content-Disposition: attachment; filename='.basename($file));
header('Content-Transfer-Encoding: binary');
header('Expires: 0');
header('Cache-Control: must-revalidate, post-check=0, pre-check=0');
header('Pragma: public');
header('Content-Length: ' . filesize($file));
//Send Chunks
while(false !== ($chunk = fread($handler,4096)))
{
echo $chunk;
}
}
exit;
}
Server 2
file_put_contents("usb.zip", fopen("http://xxx/file.php", 'r'));
Method 2: Upload via SFTP
$resFile = fopen("ssh2.sftp://{$resSFTP}/".$csv_filename, 'w');
$srcFile = fopen("/home/myusername/".$csv_filename, 'r');
$writtenBytes = stream_copy_to_stream($srcFile, $resFile);
fclose($resFile);
fclose($srcFile);