$url = 'http://www.server.com/file.ext';
$file = basename($url);
$fh = fopen($file, 'w');
$ch = curl_init(); // buat sesi curl.
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_FILE, $fh);
curl_exec($ch) or die(curl_error($ch)); // eksekusi.
curl_close($ch); // tutup sesi curl.
fclose($fh);
echo 'File berhasil disimpan. Download: <a href="'.$file.'">'.$file.'</a>';