What are the potential challenges of uploading files from one server to another in PHP?

One potential challenge when uploading files from one server to another in PHP is ensuring that the file transfer is secure and that the files are not compromised during the process. To address this, you can use secure file transfer protocols such as SFTP or HTTPS to encrypt the data being transferred. 

// Example using SFTP for secure file transfer
$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');

ssh2_scp_send($connection, $localFile, $remoteFile, 0644);

Keywords

file upload server-to-server transfer PHP FTP error handling

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