Challenge 1 — Solution

Task: Simulate a $_GET array manually (since you're not running this
through a real web server yet) with keys "product" and "qty". Safely
read both using the ?? operator with sensible defaults, and echo a
formatted sentence using the values.

<?php
    // Simulating what PHP would populate automatically from a real
    // URL like page.php?product=Notebook&qty=3
    $_GET = [
        "product" => "Notebook",
        "qty" => "3"
    ];

    $product = $_GET['product'] ?? 'Unknown item';
    $qty = $_GET['qty'] ?? '1';

    echo "You ordered {$qty} x {$product}.";
?>


Output:
You ordered 3 x Notebook.

Notes:
- The $_GET array is simulated by assignment here purely for testing
  outside a real web server - in a genuine request, PHP populates it
  automatically from the URL's own query string.
- The ?? operator provides a fallback ('Unknown item', '1') in case
  either key is missing, even though both happen to be present in this
  particular test.
- Both values come through as strings ("3", not 3), matching the
  chapter's own warning that $_GET values are never automatically cast
  to numbers.