What security considerations should be taken into account when automating FTP operations with PHP?

When automating FTP operations with PHP, it is important to consider security measures to protect sensitive data. One key consideration is to ensure that the FTP connection is secure by using encryption (FTPS) instead of plain FTP. Additionally, it is crucial to sanitize user inputs to prevent any potential security vulnerabilities such as SQL injection or directory traversal attacks. Lastly, restrict access permissions on the server to limit the actions that can be performed through FTP.

// Example of connecting to FTP server using FTPS (FTP over SSL)
$ftp_server = 'ftp.example.com';
$ftp_username = 'username';
$ftp_password = 'password';

// Connect to FTP server using FTPS
$conn_id = ftp_ssl_connect($ftp_server);

// Login to FTP server
$login_result = ftp_login($conn_id, $ftp_username, $ftp_password);

if ($conn_id && $login_result) {
    echo "Connected to $ftp_server via FTPS";
} else {
    echo "Failed to connect to FTP server";
}

// Close FTP connection
ftp_close($conn_id);