Ftp_nb_put()

Understanding the PHP Function ftp_nb_put()

The ftp_nb_put() function is a built-in PHP function that uploads a file to the FTP server using non-blocking mode. In this article, we'll discuss the function in detail and provide you with a comprehensive guide to using it in your PHP projects.

What is ftp_nb_put()?

The ftp_nb_put() function is a PHP built-in function that uploads a file to the FTP server using non-blocking mode. The function takes three parameters:

1. ftp_stream: The connection identifier returned by the ftp_connect() function.
2. remote_file: The remote file path where the file will be uploaded.
3. local_file: The local file path.

The function returns true if the operation was successful. Otherwise, it returns false.

Syntax of ftp_nb_put()

The syntax of the ftp_nb_put() function is as follows:

int ftp_nb_put ( resource $ftp_stream , string $remote_file , string $local_file , int $mode [, int $startpos = 0 ] )

The ftp_nb_put() function takes three required parameters, ftp_stream, remote_file, and local_file, and two optional parameters, mode and startpos. The ftp_stream parameter is the connection identifier returned by the ftp_connect() function. The remote_file parameter is the path to the remote file on the FTP server where the local file will be uploaded. The local_file parameter is the path to the local file that will be uploaded to the FTP server. The mode parameter specifies the transfer mode, either FTP_ASCII or FTP_BINARY. The startpos parameter specifies the position in the remote file to start the upload from. By default, startpos is set to 0, which means the upload will start from the beginning of the file.

Usage of ftp_nb_put()

To use the ftp_nb_put() function, you first need to establish a connection to the FTP server using the ftp_connect() function. Here's an example:

<?php

// Set up an FTP connection
$conn = ftp_connect('ftp.example.com');

// Login with your FTP credentials
ftp_login($conn, 'username', 'password');

// Initiate an asynchronous FTP operation
ftp_nb_put($conn, 'remote_file.txt', 'local_file.txt', FTP_BINARY);

// Continue the asynchronous FTP operation
while (ftp_nb_continue($conn)) {
    // Do something else while waiting for the FTP operation to complete
}

// Close the FTP connection
ftp_close($conn);

In this example, we establish a connection to the FTP server using the ftp_connect() function. Then we log in using our FTP credentials using the ftp_login() function. We initiate an asynchronous FTP operation using the ftp_nb_put() function. We continue the operation using the ftp_nb_continue() function and close the FTP connection.

Error handling in ftp_nb_put()

It's important to handle errors properly when using the ftp_nb_put() function. If the function returns false, it means that the upload was unsuccessful. Here's an example of how to handle errors:

<?php

$upload_successful = ftp_nb_put($conn, 'remote_file.txt', 'local_file.txt', FTP_BINARY);

if (!$upload_successful) {
    echo "Failed to upload file to remote server.\n";
}

while (ftp_nb_continue($conn)) {
    // Do something else while waiting for the FTP operation to complete
}

ftp_close($conn);

By handling errors appropriately and checking the return value of the function, you can ensure the success of your FTP operations using the ftp_nb_put() function.

Conclusion

In conclusion, the ftp_nb_put() function is a useful tool for uploading files to an FTP server using non-blocking mode. It allows you to continue with other operations while waiting for the upload to complete. With proper usage and error handling, this function can be a valuable asset in your PHP projects.