This is a very basic thing to do with cURL, but with endless possibilities. Once you have a webpage in a PHP variable, you can for example, retrieve a particular information on the page to use on your own website.
ch = curl_init();
curl_setopt($ch, CURLOPT_URL, "example.com");
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
$output = curl_exec($ch);