Как вывести дату последнего логина пользователя на страницу?

Question

Ковалко Егор @Vansky

PHP
MySQL

Как вывести дату последнего логина пользователя на страницу?

Всем привет, есть таблица "users" в phpMyAdmin, где хранится id, username, email и password зарегистрированного пользователя, задача в том, чтобы вывести дату последнего входа пользователя. Код PHP:

<?php 
  session_start(); 
  if (!isset($_SESSION['username'])) {
  	$_SESSION['msg'] = "You must log in first";
  	header('location: login.php');
  }
  if (isset($_GET['logout'])) {
  	session_destroy();
  	unset($_SESSION['username']);
  	header("location: login.php");
  } 
?>
<!DOCTYPE html>
<html>
<head>
	<title>Home</title>
	<link rel="stylesheet" type="text/css" href="css/main_3.css">
</head>
<body>
    <table>
        <tr>
          <th>name</th>
          <th>email</th>
          <th>last login</th>
        </tr>
      </label>
    

   <?php 
    $db = mysqli_connect('localhost', 'root', '', 'registration');

    $query="SELECT*FROM users WHERE id>0";


    mysqli_query($db,$query) or die(mysqli_error($db));

    $result=mysqli_query($db,$query) or die(mysqli_error($db));

    for($data=[];$row=mysqli_fetch_assoc($result);$data[]=$row) ;
    $result='';
    foreach($data as $elem) {
        $result.='<tr>';
        $result.='<td>'.$elem['username'].'</td>';
        $result.='<td>'.$elem['email'].'</td>';
        $result.='<td>'.$elem['last login'].'</td>';
        $result.='</tr>';
    }
    echo $result;


   ?>
</table>
</body>
</html>

Код сервера.php:

<?php
session_start();

// initializing variables
$username = "";
$email    = "";
$errors = array(); 

// connect to the database
$db = mysqli_connect('localhost', 'root', '', 'registration');

// REGISTER USER
if (isset($_POST['reg_user'])) {
  // receive all input values from the form
  $username = mysqli_real_escape_string($db, $_POST['username']);
  $email = mysqli_real_escape_string($db, $_POST['email']);
  $password_1 = mysqli_real_escape_string($db, $_POST['password_1']);
  $password_2 = mysqli_real_escape_string($db, $_POST['password_2']);

  // form validation: ensure that the form is correctly filled ...
  // by adding (array_push()) corresponding error unto $errors array
  if (empty($username)) { array_push($errors, "Username is required"); }
  if (empty($email)) { array_push($errors, "Email is required"); }
  if (empty($password_1)) { array_push($errors, "Password is required"); }
  if ($password_1 != $password_2) {
    array_push($errors, "The two passwords do not match");
  }

  // first check the database to make sure 
  // a user does not already exist with the same username and/or email
  $user_check_query = "SELECT * FROM users WHERE username='$username' OR email='$email' LIMIT 1";
  $result = mysqli_query($db, $user_check_query);
  $user = mysqli_fetch_assoc($result);
  
  if ($user) { // if user exists
    if ($user['username'] === $username) {
      array_push($errors, "Username already exists");
    }

    if ($user['email'] === $email) {
      array_push($errors, "email already exists");
    }
  }

  // Finally, register user if there are no errors in the form
  if (count($errors) == 0) {
    $password = md5($password_1);//encrypt the password before saving in the database

    $query = "INSERT INTO users (username, email, password) 
              VALUES('$username', '$email', '$password')";
    mysqli_query($db, $query);
    $_SESSION['username'] = $username;
    $_SESSION['success'] = "You are now logged in";
    header('location: index.php');
  }
}
if (isset($_POST['login_user'])) {
  $username = mysqli_real_escape_string($db, $_POST['username']);
  $password = mysqli_real_escape_string($db, $_POST['password']);

  if (empty($username)) {
    array_push($errors, "Username is required");
  }
  if (empty($password)) {
    array_push($errors, "Password is required");
  }

  if (count($errors) == 0) {
    $password = md5($password);
    $query = "SELECT * FROM users WHERE username='$username' AND password='$password'";

    $results = mysqli_query($db, $query);
    if (mysqli_num_rows($results) == 1) {
      $_SESSION['username'] = $username;
      $_SESSION['success'] = "You are now logged in";
      header('location: index.php');
    }else {
      array_push($errors, "Wrong username/password combination");
    }
  }
}

?>

Зараннее спасибо за помощь!