PHP ftp_nb_put() function (with example)

Greetings everyone,

I've stumbled upon this thread and thought I'd share my personal experience with the `ftp_nb_put()` function.

I had a similar requirement where I needed to upload files via FTP in a non-blocking manner. Initially, I found the concept a bit confusing, but after some experimentation, I figured out a practical approach.

One thing I found helpful was using callbacks. You can define custom callback functions to handle the progress and completion of the upload. For example, you could create a callback function to display progress information or update a progress bar on your website.

Here's a modified version of the example provided earlier, incorporating callbacks:

php
function uploadProgress($resource, $uploadedSize, $fileSize) {

    // Calculate the percentage of completion

    $percentage = (int)((($uploadedSize * 1.0) / $fileSize) * 100);

    

    // Display the progress or update your progress bar

    echo "File upload progress: $percentage% \r";

    flush();

}



// Connect to FTP server and login



// Initialize non-blocking upload

$ftpHandle = ftp_nb_put($ftpConnection, $remoteFile, $localFile, FTP_BINARY);

ftp_set_progress_handler($ftpConnection, "uploadProgress");



// Check for any errors while uploading

while ($ftpHandle === FTP_MOREDATA) {

    // Continue uploading

    

    // Sleep and perform other tasks if needed



    // Check the status of the upload

    $ftpHandle = ftp_nb_continue($ftpConnection);

}



// Upload completed or encountered an error



// Close the FTP connection

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Hey there,

I've also used the `ftp_nb_put()` function before and it's a handy method for non-blocking file uploads via FTP. I'd be happy to share my experience with you.

The example shared by [Your Name] is pretty solid and covers the essential steps. However, I'd like to add some extra tips to help you make the most out of `ftp_nb_put()`.

1. Error handling: Along with checking the return value of `ftp_nb_put()` and the continuous checks with `ftp_nb_continue()`, you can also utilize `ftp_nb_fget()` and `ftp_nb_fput()` functions to monitor any error or exception that might occur during the transfer. This way, you can promptly handle and log any issues.

2. Progress tracking: If you want to display the progress of the upload to your users, you can use the `ftp_size()` function to retrieve the size of the file on the remote server before starting the upload. With this information, you can calculate the percentage of completion and give users a real-time update on the progress.

3. Timeouts and connection management: While performing non-blocking transfers, it's crucial to set appropriate timeouts to avoid long delays. You can use `ftp_set_option()` with the `FTP_TIMEOUT_SEC` parameter to adjust the timeout value. Additionally, make sure you handle connection interruptions gracefully by checking the return values and implementing appropriate reconnect logic if needed.

Remember, the `ftp_nb_put()` function operates asynchronously, allowing your script to continue executing other tasks while the file is being uploaded. This can be especially useful for large file transfers or scenarios where you need to perform simultaneous operations.

If you have any more questions or specific concerns about using `ftp_nb_put()`, feel free to ask. We're here to help you out!

Best regards,
[Your Name]

Hey [Your Name],

I've used the `ftp_nb_put()` function in the past, so I can definitely help you out. To use `ftp_nb_put()`, you'll need to establish an FTP connection first using `ftp_connect()` and `ftp_login()`, specifying the server, username, and password.

Here's a simple example of how you can use `ftp_nb_put()` to upload a file:

php
$ftpServer = 'ftp.example.com';

$ftpUsername = 'your_username';

$ftpPassword = 'your_password';



// Connect to FTP server

$ftpConnection = ftp_connect($ftpServer) or die('Could not connect to server');

ftp_login($ftpConnection, $ftpUsername, $ftpPassword) or die('Could not login');



// Initialize non-blocking upload

$localFile = 'path/to/local/file.txt';

$remoteFile = 'path/to/remote/file.txt';

$ftpHandle = ftp_nb_put($ftpConnection, $remoteFile, $localFile, FTP_BINARY);



// Check for any errors while uploading

while ($ftpHandle === FTP_MOREDATA) {

    // Continue uploading...

    // You can perform other tasks here while the file is being uploaded

    // For example, you can display a progress bar or update a database



    // Sleep for a short time to avoid overloading the server

    sleep(1);



    // Check the status of the upload

    $ftpHandle = ftp_nb_continue($ftpConnection);

}



// Upload completed or encountered an error

if ($ftpHandle === FTP_FINISHED) {

    echo "File uploaded successfully!";

} else {

    echo "Error uploading file: " . ftp_nb_continue($ftpConnection);

}



// Close the FTP connection

ftp_close($ftpConnection);

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