function price_book($book)
{
global $SELLERS_URL;
$best_book_price = 1000;
$best_book_ship = 2.99;
$best_book_ISBN = "";
$best_book_url = NULL;
$best_book_price_amazon = 0;
// replace entites quote
$book = str_replace("’", "'", $book);
$book = urlencode($book);
// 0. parse all books from pmba reading list
foreach ($SELLERS_URL as $seller_url) {
// 1. Parse all sellers and save best price + url
$seller_price = price_book_sellers($seller_url, $book);
if (isset($seller_price)) {
$price = $seller_price[0];
$url = $seller_price[1];
// test best price
if ($price < $best_book_price) {
$best_book_price = $price;
$best_book_url = $url;
}
}
}
// 2. from best book price url, get price, ship price, ISBN
if (!isset($best_book_url)) {
return;
}
$ISBN = get_ISBN($best_book_url);
$best_book_price_amazon = get_amazon_price($book);
return array($best_book_price_amazon, $best_book_price, $best_book_ship, $best_book_ISBN, $best_book_url);
}
function get_best_price($ISBN)
{
$amazon_url = "http://www.amazon.fr/gp/offer-listing/" . $ISBN . "/sr=/qid=/ref=olp_tab_all?ie=UTF8&shipPromoFilter=0&coliid=&sort=sip&me=&qid=&sr=&seller=&colid=&condition=all";
$html = connect_to($amazon_url);
$html = str_get_html($html);
// 0. First price is the cheapest one.
$result = $html->find('.result', 0);
$cheapest_price = $result->find('.price', 0)->plaintext;
//1. Get the premium premium price
$amazon_price = 0;
$supersaver = $html->find('.supersaver', 0);
if (isset($supersaver)) {
$supersaver = $supersaver->parent();
$amazon_price = $supersaver->find('.price', 0)->plaintext;
} else {
$amazon_price = get_amazon_price($ISBN);
}
$html->clear();
unset($html);
return array($amazon_price, $cheapest_price);
}