function upload($file){
global $file_name;
$c=ftp_connect("ftp.site.com");
ftp_login($c, "user", "pass");
ftp_chdir($c, $dir);
ftp_put($c, $file_name, $file, FTP_BINARY);
ftp_quit($c);
}

ili

function upload($file){
$c=ftp_connect("ftp.site.com");
ftp_login($c, "user", "pass");
ftp_chdir($c, $dir);
ftp_put($c, $GLOBALS["file_name], $file, FTP_BINARY);
ftp_quit($c);
}