php ftp upload problem - php

Question

I am trying to write a small php function that will upload files to an FTP server and I keep getting the same error but I cannot find any fix by googling the problem, I am hoping you guys can help me here...
The error I get is: Warning: ftp_put() [function.ftp-put]: Unable to build data connection: No route to host in .
The file was created at the FTP server but it is zero bytes.
Here is the code:
<?php
$file = "test.dat";
$ftp_server="ftp.server.com";
$ftp_user = "myname";
$ftp_pass = "mypass";
$destination_file = "test.dat";
$cid=ftp_connect($ftp_server);
if(!$cid) {
exit("Could not connect to server: $ftp_server\n");
}
$login_result = ftp_login($cid, $ftp_user, $ftp_pass);
if (!$login_result) {
echo "FTP connection has failed!";
echo "Attempted to connect to $ftp_server for user $ftp_user";
exit;
} else {
echo "Connected to $ftp_server, for user $ftp_user";
}
$upload = ftp_put($cid, $destination_file, $file, FTP_BINARY);
if (!$upload) {
echo "Failed upload for $source_file to $ftp_server as $destination_file<br>";
echo "FTP upload has failed!";
} else {
echo "Uploaded $source_file to $ftp_server as $destination_file";
}
ftp_close($cid);
?>

Answer 1

I forgot to put FTP in passive mode using:
ftp_pasv($cid, true);