Ftp_size()

Understanding the PHP Function ftp_size()

The ftp_size() function is a built-in PHP function that retrieves the size of a file on the FTP server. 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_size()?

The ftp_size() function is a PHP built-in function that retrieves the size of a file on the FTP server. The function takes two parameters:

1. ftp_stream: The connection identifier returned by the ftp_connect() function.
2. remote_file: The name of the file to retrieve the size of.

The function returns the size of the file on success and false on failure.

Syntax of ftp_size()

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

int ftp_size ( resource $ftp_stream , string $remote_file )

The ftp_size() function takes two required parameters, ftp_stream and remote_file. The ftp_stream parameter is the connection identifier returned by the ftp_connect() function, and remote_file is the name of the file to retrieve the size of.

Usage of ftp_size()

To use the ftp_size() 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');

// Get the size of the file index.php
$file_size = ftp_size($conn, '/public_html/index.php');

// Display the size of the file
echo "The size of the file is: " . $file_size . " bytes.";

// 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 use the ftp_size() function to get the size of the file index.php and store it in the $file_size variable. Finally, we display the size of the file and close the FTP connection using the ftp_close() function.

Error handling in ftp_size()

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

<?php

$file_size = ftp_size($conn, '/public_html/index.php');

if ($file_size === false) {
    echo "Failed to get the size of the file.\n";
} else {
    echo "The size of the file is: " . $file_size . " bytes.";
}

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_size() function.

Conclusion

In conclusion, the ftp_size() function is a useful tool for retrieving the size of a file on the FTP server. With proper usage and error handling, this function can be a valuable asset in your PHP projects.