<?php
/*********************************************
* step 2
* - get_products_by_category($category_id)
**********************************************/
function get_products_by_category($category_id) {
    global $db;
    $query = 'SELECT * FROM products
              WHERE products.categoryID = :category_id
              ORDER BY productID';
    $statement = $db->prepare($query);
    $statement->bindValue(":category_id", $category_id);
    $statement->execute();
    $products = $statement->fetchAll();
    $statement->closeCursor();
    return $products;
}

?>