In the context of PHP development, what are some common mistakes or misconceptions that developers may encounter when working on a shopping cart functionality?

Issue: One common mistake developers may encounter when working on a shopping cart functionality is not properly sanitizing user input, which can lead to security vulnerabilities such as SQL injection attacks. To solve this issue, developers should always use prepared statements or parameterized queries when interacting with the database to prevent SQL injection. 

// Incorrect way of querying the database without sanitizing user input
$user_input = $_POST['user_input'];
$query = "SELECT * FROM products WHERE name = '$user_input'";
$result = mysqli_query($connection, $query);

// Correct way of using prepared statements to sanitize user input
$user_input = $_POST['user_input'];
$query = "SELECT * FROM products WHERE name = ?";
$stmt = $connection->prepare($query);
$stmt->bind_param("s", $user_input);
$stmt->execute();
$result = $stmt->get_result();

Keywords

shopping cart functionality PHP development common mistakes misconceptions error types

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