PHP & FTP? Any experts to help a beginner

Need help on getting started with FTP functions of PHP but seem stuck at very first obstacle - can anybody assist? I can connect to ftp server and do all sorts of directory based things such as creating and changing but cannot successfully upload a file from my PC - so very basic flaw in FTP useage.

<?php
$ftp_server="www.mysite.uk";
$ftp_user_name="myname";
$ftp_user_pass="mypass";
$destination_file="test.txt";
$source_file="c:\dja\test.txt";
// set up basic connection
$conn_id = ftp_connect($ftp_server);
// login with username and password
$login_result = ftp_login($conn_id, $ftp_user_name, $ftp_user_pass);
// check connection
if ((!$conn_id) || (!$login_result)) {
echo "FTP connection has failed!";
echo "Attempted to connect to $ftp_server for user $ftp_user_name";
exit;
} else {
echo "Connected to $ftp_server, for user $ftp_user_name<p>";

//stuff inserted to test connection - all works ok
ftp_chdir($conn_id, "/djapix/");
echo ftp_pwd($conn_id);
echo"<p>";
ftp_mkdir($conn_id, "testdir");
//just testing!

}
// upload the file
$upload = ftp_put($conn_id, $destination_file, $source_file, FTP_ASCII,0);
// check upload status
if (!$upload) {
echo "FTP upload has failed!";
} else {
echo "Uploaded $source_file to $ftp_server as $destination_file";
}
// close the FTP stream
ftp_close($conn_id);
?>

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