<?php include 'view/header.php'; ?> <main> <nav> <h2>Administrators</h2> <ul> <li><a href="product_manager">Manage Products</a></li> <li><a href="under_construction.php">Manage Technicians</a></li> <li><a href="under_construction.php">Manage Customers</a></li> <li><a href="under_construction.php">Create Incident</a></li> <li><a href="under_construction.php">Assign Incident</a></li> <li><a href="under_construction.php">Display Incidents</a></li> </ul> <h2>Technicians</h2> <ul> <li><a href="under_construction.php">Update Incident</a></li> </ul> <h2>Customers</h2> <ul> <li><a href="under_construction.php">Register Product</a></li> </ul> </nav> </section> <?php include 'view/footer.php'; // index.php in the product_manager folder <?php require('../model/database.php'); // require('../model/product_db.php'); $action = filter_input(INPUT_POST, 'action'); if ($action === NULL) { $action = filter_input(INPUT_GET, 'action'); if ($action === NULL) { $action = 'under_construction'; } } if ($action == 'under_construction') { include('../under_construction.php'); } For this project, you'll create an application that lets an admin user maintain customer data. To start, this application lets the user select an existing customer. Then, the user can view or update the customer's data. (Required reading: chapters 1-6) The Select Customer page - When the user enters a last name and clicks the Search button, the application displays a table of customers with the specified last name. - When the user clicks the Select button for a customer, the data for that customer is displayed on the View/Update Customer page..