Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial

Development Tools Using PHP with MySQL Filtering Input for Queries Using a WHERE Clause

Robert Mews
Robert Mews
11,540 Points
Posted by Robert Mews
Robert Mews
11,540 Points

Separation of Concerns

In the shirt.php code we have controller code that calls the get_product_single function if the id is set and passes the product id as the argument.

if (isset($_GET["id"])) {
    $product_id = $_GET["id"];
    $product = get_product_single($product_id);
}

In the model, we have the get_product_single function again with the argument of "sku"

function get_product_single($sku) {

}

separating concerns certainly makes sense, but doing so can be somewhat confusing. Is this code essentially saying if "id" is set, pass the id to a variable of product_id and pass that along with sku as arguments for the get_product_single function? Would this code work the same if we weren't separating concerns?

if (isset($_GET["id"])) {
    $product_id = $_GET["id"];
    $product = get_product_single($product_id, $sku);
}