ท่านใดพอมีแนวทางเขียน php อัพโหลดไฟล์ ข้ามเซิฟเวอร์ได้บ้างครับ

<?php
#FTP
################################
//-- Connection Settings
$ftp_server = "www.domain-a.com"; // Address of FTP server.
$ftp_user_name = "username"; // Username
$ftp_user_pass = "password"; // Password 

// define some variables
$local_file = 'filename.zip';
$server_file = 'public_html/filename.zip';

// set up basic connection
$conn_id = ftp_connect($ftp_server);
// login with username and password
$login_result = ftp_login($conn_id, $ftp_user_name, $ftp_user_pass);
// try to download $server_file and save to $local_file
if (ftp_get($conn_id, $local_file, $server_file, FTP_BINARY)) {
    echo "Successfully written to $local_file\n<br>";
} else {
    echo "There was a problem\n<br>";
}
// close the connection
ftp_close($conn_id);

#ZIP
################################
$zip = new ZipArchive;
if ($zip->open($local_file) === TRUE)
{
$zip->extractTo('./');
$zip->close();
echo 'ok';
} else {
echo 'failed';
}
?>