/PHP/How to get session variables from cookie string

How to get session variables from cookie string

<?php
require_once 'login.php';

$connection = new mysqli($db_hostname,$db_username,$db_password,$db_database);
if($connection->connect_error) die ($connect->connect_error);

if (isset($_SERVER['PHP_AUTH_USER']) &&
   isset($_SERVER['PHP_AUTH_PW']))
    {
        $username = mysql_entities_fix($connection,$_SERVER['PHP_AUTH_USER']);
        $password = mysql_entities_fix($connection,$_SERVER['PHP_AUTH_PW']);

        $query = "SELECT * FROM user WHERE username = '$username'";

        $result = $connection->query($query);

        if(!$result) die ($connection->error);
        elseif ($result->num_rows) 
        {
            $row = $result->fetch_array(MYSQLI_NUM);    
            $result->close();
            $salt1="!@#$";
            $salt2="$#@!";
            $token = hash('ripemd128',"$salt1$password$salt2"); 

            if($token == $row[3])
                {
                    session_start();
                    $_SESSION['username'] = $username;
                    $_SESSION['password'] = $password;
                    $_SESSION['forename'] = $row[0];
                    $_SESSION['surname'] = $row[1];
                        echo "$row[0] $row[1] : Hi '$row[0]' you are logged
                            in as '$row[2]'";
                    die("<p><a href = continue.php> CLICK HERE TO CONTINUE</a></p>");
                }
            else    {die("Invalid Username/ Password Combination");}            
        }
        else
            {
                die("Invalid Username/ Password Combination");
            }
    }
else
    {
            header('WWW-Authenticate: Basic realm="Restricted Section"');
                header('HTTP/1.0 401 Unauthorized');
                die("Please enter your username and password to Login");
    }
    $connection->close();
function mysql_entities_fix($connection,$var)
    {
        return htmlentities(mysql_entities_string($connection,$var));
    }
function mysql_entities_string($connection,$var)
    {
        if (get_magic_quotes_gpc()) $var = stripslahes($var);
        return $connection->real_escape_string($var);

    }
?>

Source: stackoverflow.com

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