server

<?php
session_start();

//initialize variables
$name = "";
$address = "";
$id = 0;
$update = false;

// Connect to database

$db = mysqli_connect('localhost', 'root', '','crud');

// if save button is clicked
if (isset($_POST['save'])) {
    $name = $_POST['NAME'];
    $address = $_POST['ADDRESS'];

    mysqli_query($db, "INSERT INTO info (name, address) VALUES ('$name', 'address')");
    $_SESSION['message'] = "Address saved";
    header('location: index.php');
}
// update records
if (isset($_POST['update'])) {
    $id = $_POST['id'];
    $name = $_POST['name'];
    $address = $_POST['address'];

    mysqli_query($db, "UPDATE info SET name='$name', address='$address' WHERE id=$id");
    $_SESSION['message'] = "Address updated!";
    header('location: index.php');
}
// delete records
if (isset($_GET['del'])) {
    $id = $_GET['del'];
    mysqli_query($db, "DELETE FROM info WHERE id=$id");
    $_SESSION['message'] = "Address deleted!";
    header('location: index.php');
}
// retrieve records
$results = mysqli_query($db, "SELECT * FROM info");
?>