Are there any best practices for managing file uploads and transfers between servers in PHP?

When managing file uploads and transfers between servers in PHP, it is important to ensure security, reliability, and efficiency. One common best practice is to use secure protocols like SFTP or HTTPS for transferring files between servers. Additionally, validating file types, sizes, and permissions before processing uploads can help prevent security vulnerabilities. Implementing error handling and logging mechanisms can also help track and troubleshoot any issues that may arise during file transfers.

// Example of securely transferring a file from one server to another using SFTP

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

$connection = ssh2_connect('remote.server.com', 22);
ssh2_auth_password($connection, 'username', 'password');

if (ssh2_scp_send($connection, $localFile, $remoteFile, 0644)) {
    echo "File transferred successfully.";
} else {
    echo "Error transferring file.";
}