The PHP ftp_fput() function uploads from an open file and saves it to a file on the FTP server.

<?php
// connect and login to FTP server
$ftp_server = 'ftp.example.com';

$ftp_conn = ftp_connect($ftp_server) or die('Could not connect to ' . $ftp_server);
$login = ftp_login($ftp_conn, $ftp_username, $ftp_userpass);

// open file for reading
$file = 'test.txt';
$fp = fopen($file, 'r');

// upload file
if (ftp_fput($ftp_conn, 'my-file.txt', $fp, FTP_ASCII)) {
    echo 'File successful uploaded';
}
else {
    echo 'Upload failed';
}

// close connection and file handler
ftp_close($ftp_conn);
fclose($fp);
?>

// opens a local file and uploads it to a file on the FTP server

ftp_fput(ftp_conn, remote_file, open_file, mode, startpos)