What are the differences between uploading and downloading files in PHP when transferring them between a cloud service and a web server?

When transferring files between a cloud service and a web server in PHP, uploading involves sending files from the client to the server, while downloading involves retrieving files from the server to the client. To upload files to a cloud service, you would typically use an API provided by the service to send the files. To download files from a cloud service, you would use the API to retrieve the files and then save them to the web server.

// Uploading a file to a cloud service
$cloudServiceAPI->uploadFile('path/to/local/file.txt', 'remote/path/file.txt');

// Downloading a file from a cloud service
$fileContent = $cloudServiceAPI->downloadFile('remote/path/file.txt');
file_put_contents('path/to/local/file.txt', $fileContent);