Force parameters to match expected data types. If an ID should always be a number, use PHP functions like intval() to convert the input into an integer, stripping away any hidden malicious text.
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After making a purchase, a customer might be redirected to a receipt page with a structure like view_order.php?id=1 . The script reads the order number "1" and displays the specific billing and shipping details. The Security Risks of Parameter-Based Shopping URLs php id 1 shopping
Competitors can scrape your entire catalog trivially. They write a simple Python script that loops:
Because the code above directly injects the $_GET['id'] into the SQL query, a hacker does not have to send ?id=1 . They can send: Force parameters to match expected data types
$order_id = $_GET['order_id']; $query = "SELECT * FROM orders WHERE id = $order_id"; $result = mysqli_query($conn, $query); $order = mysqli_fetch_assoc($result); echo "Your order details: " . print_r($order, true);
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Since product IDs are almost always integers, developers can explicitly force the input to be an integer before processing it.
: Use $_GET['id'] to grab the specific product number from the link (e.g., cart.php?id=1 ).