CODEWITHSUNDEEP
phpftp
Nancy
Nancy

Reputation: 504

Downloading only new images from FTP server in PHP

I made a little script which allows me to download images from FTP server. But, the thing is, whenever I execute the script, ALL images are downloaded. Is there any way to rewrite the code so that it only downloads new images?

My script looks like this:

$ftp_server = "my_server_ip";
$ftp_user = "my_user_name";
$ftp_pass = "my_password";
$DIR="my_path_to_images_folder";

$conn = ftp_connect($ftp_server);
if(!$conn)
{
    exit("Can not connect to server: $ftp_server\n");
}

if(!ftp_login($conn,$ftp_user,$ftp_pass))
{
    ftp_quit($conn);
    exit("Can't login\n");
}

ftp_chdir($conn,$DIR);

$files = ftp_nlist($conn,'.');
for($i=0;$i<count($files);$i++)
{
    if(!ftp_get($conn,$files[$i],$files[$i],FTP_BINARY))
    {
        echo "Can't download {$files[$i]}\n";
    }
    else
    {
        echo "Successfully transferred images!";
    }
}

ftp_quit($conn);

Thank you.

Upvotes: 1

Views: 1900

Answers (3)

Martin Prikryl
Martin Prikryl

Reputation: 202262

To download only files that do not exist locally yet, or are newer than the local copy, use:

$files = ftp_nlist($conn, '.');

foreach ($files as $file)
{
    $remote_time = ftp_mdtm($conn, $file);

    if (!file_exists($file) ||
        (filemtime($file) < $remote_time))
    {
        ftp_get($conn, $file, $file, FTP_BINARY);
        touch($file, $remote_time);
    }
}

If your server supports MLSD command and you have PHP 7.2 and newer, you can replace ftp_nlist and repeated call to ftp_mdtm with one efficient call to ftp_mlsd function.

See also How to get last modified text files by date from remote FTP location

Upvotes: 6

Michail M.
Michail M.

Reputation: 755

You can check image availability with method file_exists()
If this method return true, don't copy than file.
I guess you can modify script without my help :)

Upvotes: 2

Stuart
Stuart

Reputation: 6795

You'll need to define "new".

Write out to a log file the images that have been transferred, then next time the script runs you can lookup whats already been transferred and only transfer your "new" images (the ones not in the log file...)

Upvotes: 1

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