What are some PHP functions that can be used to download files from a remote server to a local server?

To download files from a remote server to a local server using PHP, you can use functions like `file_get_contents()` or `copy()`. These functions allow you to retrieve the contents of a remote file and save it locally. You can specify the URL of the remote file as the parameter for these functions.

// Download file using file_get_contents()
$url = 'http://www.example.com/file.zip';
$local_file = 'local_file.zip';

file_put_contents($local_file, file_get_contents($url));

// Download file using copy()
$url = 'http://www.example.com/file.zip';
$local_file = 'local_file.zip';

copy($url, $local_file);