Building a shopping cart

[davidf85]

I am building a shopping cart with PHP and working with a tutorial

(http://jameshamilton.eu/content/simple-php-shopping-cart-tutorial)

 

I am putting together the cart and there is some coding

$sql = sprintf("SELECT name, description, price FROM php_shop_products WHERE id = %d;",

$product_id);

That i do not understand. Here it is "WHERE id = %d;"

I have never seen this before and am wondering what it means or how to work with this syntax

[PFMaBiSmAd]

sprintf