PHP example of querying book information on the Amazon website based on isbn book number_PHP tutorial

function PIPHP_GetBookFromISBN($isbn)
{
// Plug-in 93: Get Book From ISBN
//
// This plug-in looks up an ISBN-10 at Amazon. com and then
// returns the matching book title and a thumbnail image
// of the front cover. It requires this argument:
//
// $isbn: The ISBN to look up
//
// Updated from the function in the book to take into
// account changes to the Amazon HTML.

$find = ' $img = 'http://ecx.images-amazon.com/images/I';

$page = @file_get_contents($url);
if (!strlen($page)) return array(FALSE);

$ptr1 = strpos($page, $find) + strlen($find);
if (!$ptr1) return array(FALSE);

$ptr2 = strpos($page, '" />', $ptr1);
$title = substr($page, $ptr1, $ptr2 - $ptr1);

$find = $img;
$ptr1 = strpos($page, $find) + strlen($find);
$ptr2 = strpos($page, '"', $ptr1);
$image = substr($page, $ptr1, $ptr2 - $ptr1);

return array($title, $img . $image);
}