Curl loop to fetch multiple pages

Question

I'm trying to fetch all the 'favorited' tweets made by myself.

Firstly the API only returns the last 20 favorited tweets via this URL:

http://twitter.com/favorites.xml (Must be authenticated to view)

I can use a URL like this, to fetch a different page:

http://twitter.com/favorites.xml?page=2

Im using this code to work out the number of Favorites the user has:

//Twitter Details
$username = "bob";
$password = "password";

//Get number of favorites
$xml=file_get_contents('http://twitter.com/users/show.xml?screen_name='.$username.'');
if (preg_match('/favourites_count>(.*)</',$xml,$match)!=0) {
    $tw['count'] = $match[1];
}
$favs = $tw['count'];

//Twitter API returns max 20 favorites per page
$maxperpage = 20;
//Divide the total number of favorites by max per page
$totalpages = ceil($favs / $maxperpage);
//Total rounded up so we get final page
echo $totalpages;

Dividing the total number of favorites by 20 then rounding that number up gives the total number of pages I need to loop through.

I'm then using this code to get the latest 20 tweets:

$twitterHost = "http://twitter.com/favorites.xml";
$curl;
$curl = curl_init();
curl_setopt($curl, CURLOPT_CONNECTTIMEOUT, 2);
curl_setopt($curl, CURLOPT_HEADER, false);
curl_setopt($curl, CURLOPT_HTTPAUTH, CURLAUTH_BASIC);
curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($curl, CURLOPT_USERPWD, "$username:$password");
curl_setopt($curl, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_1_1);
curl_setopt($curl, CURLOPT_URL, $twitterHost);
$result = curl_exec($curl);
curl_close($curl);

echo $result;

I now need to combine the above 2 scripts to loop through the script the right amount of times to get all favorites...

Can anyone help?