PHP and MySQL Web Development 4th Ed-tqw-_darksiderg

Backing Up or Mirroring a File
461
Listing 20.4
Continued
else
$localtime=0;
$remotetime = ftp_mdtm($conn, $remotefile);
if (!($remotetime >= 0))
{
// This doesn't mean the file's not there, server may not support mod
time
echo 'Can\'t access remote file time.';
$remotetime=$localtime+1; // make sure of an update
}
else
{
echo 'Remote file last updated ';
echo date('G:i j-M-Y', $remotetime);
echo '';
}
if (!($remotetime > $localtime))
{
echo 'Local copy is up to date.';
exit;
}
// download file
echo 'Getting file from server...';
$fp = fopen ($localfile, 'w');
if (!$success = ftp_fget($conn, $fp, $remotefile, FTP_BINARY))
{
echo 'Error: Could not download file';
ftp_quit($conn);
exit;
}
fclose($fp);
echo 'File downloaded successfully';
// close connection to host
ftp_quit($conn);
?>
The output from running this script on one occasion is shown in Figure 20.4.