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Q:

PHP ftp_nb_put() function (with example)

Hey everyone,

I hope you're doing well. I have a question regarding the PHP `ftp_nb_put()` function. I'm currently working on a project where I need to upload files to a remote server using FTP, but I want the file transfer to be non-blocking.

I came across the `ftp_nb_put()` function in the PHP documentation, but I'm a bit confused about how to use it properly. I understand that it allows for non-blocking file uploads, but I'm not sure about the syntax and how to handle the progress of the upload.

Would anyone be able to provide me with a simple example of how to use the `ftp_nb_put()` function? It would be really helpful if you could explain each step and any additional configuration that may be required.

Thank you so much in advance. I truly appreciate any assistance you can provide.

Best regards,
[Your Name]

All Replies

vincenzo.grimes

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


In this updated example, I've added a `uploadProgress()` function as a custom callback. This function receives the FTP connection resource, uploaded file size, and total file size. It calculates the percentage of completion and displays or updates the progress information.

By calling `ftp_set_progress_handler()` after initiating the non-blocking upload, our `uploadProgress()` function will be automatically invoked during the upload process, allowing us to track the progress in real-time.

I hope this insight helps you understand the `ftp_nb_put()` function better. If you have any further inquiries or ideas to share, please feel free to join the discussion.

Best regards,
[Your Name]

hgrant

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]

colt.thompson

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);


In this example, we connect to the FTP server using `ftp_connect()` and `ftp_login()`. Then, we initialize the non-blocking upload using `ftp_nb_put()` by specifying the local file path, remote file path, and transfer mode.

To monitor the progress of the upload, we enter a `while` loop and repeatedly call `ftp_nb_continue()` until the upload is completed or an error occurs. Inside the loop, you can perform additional tasks as needed.

Finally, we check the status of the upload after exiting the loop. If the upload is successful, we display a success message. Otherwise, we display an error message.

I hope this helps! Let me know if you have any further questions or if there's anything else I can assist you with.

Best regards,
[Your Name]

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