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<?php 
// array with product names
$products = array('iphone 6', 'samsung galaxy s3', 'nokia lumnia');
// count products in array
$quantity = count($products);
// minimum number of products to append additional shipping cost
$min = 2;
// cost for first product
$basecost = 10;
// cost for each additional product
$addedcost = 3;
// calculation if there is more then 1 product in the shopping bag
if($min > 1) {
  $count = $quantity - 1;
  $total =  $basecost + ($count * $addedcost);
}
// calculation if there is only 1 product in the shopping bag
else {
  $count = $quantity;
  $total =  $basecost;
}

echo 'There are '.$quantity.' products in your shopping bag<br>';
echo 'Shipping cost is '.$total.' USD';

?>