Database Normalization

Currently, we store our users' statuses in the same table as the users themselves. However, this is incorrect - we end up with a non-normalized table, since the words 'user' and 'admin' are repeated many times.

It is necessary to perform normalization - let's move our statuses to a separate table statuses:

And in the users table, we will create a column status_id. Now during registration, we will write the status's id from the statuses table into the status_id column:

html<?php
  $query = "INSERT INTO users
    SET login='$login', password='$password', status_id='1'";
?>

The most significant changes will occur during authorization: to get the user's status, we will need to perform a LEFT JOIN:

html<?php
  $login = $_POST['login'];
  
  // Get the user by login and join the status:
  $query = "SELECT users.*, statuses.name as status FROM users
    LEFT JOIN statuses
  ON users.status_id=statuses.id WHERE login='$login'";
  
  $res = mysqli_query($link, $query);
  $user = mysqli_fetch_assoc($res);
  
  if (!empty($user)) {
    $hash = $user['password'];
    
    if (password_verify($_POST['password'], $hash)) {
      $_SESSION['auth'] = true;
      $_SESSION['status'] = $user['status']; // status
    } else {
      
    }
  } else {
    
  }
?>