session store only one item in array - php

Question

I'm a new in php, I have a sign up form and I want to store users registered in an array or JSON,
I built user class and when I register a new user I want to add it into this array or JSON, but session array accept only one user in it and when I adding new user session removing the old one and store the new one!
This is my code:
class User
{
private $id;
private $first_name;
private $last_name;
private $email;
private $password;
public function register($id, $firstName, $lastName, $email, $password)
{
$this->id = $id;
$this->first_name = stripslashes($firstName);
$this->last_name = stripslashes($lastName);
$this->email = $email;
$this->password = password_hash($password, PASSWORD_DEFAULT);
}
}
class DB
{
public $users;
public function __construct()
{
$this->users = [];
}
}
<?php
$counter = 0;
$_SESSION['usersDB'] = new DB;
if (isset($_POST['submit'])) {
$firstName = $_POST['firstName'];
$lastName = $_POST['lastName'];
$email = $_POST['email'];
$password = $_POST['password'];
$user = new User;
$user->register(++$counter, $firstName, $lastName, $email, $password);
array_push($_SESSION['usersDB']->users, $user);
}
echo '<pre>';
var_dump($_SESSION['usersDB']);
echo '</pre>';
?>
What I should do to sole this and store all users in one place?

Answer 1

You're replacing the session variable with new DB each time you run the script. You shouldn't do that if the session variable is already set.
if (!isset($_SESSION['userdDB'])) {
$_SESSION['usersDB'] = new DB;
}
Also, $counter will always be 1, since you're setting $counter = 0; at the beginning of the script. You could save this in a session variable, but there isn't really a need. You can just use:
$counter = count($_SESSION['usersDB']->users);
I'm not really sure this will do what you really want. Every browser session has its own session variables, so each user will just have a list of users that they have registered. Session variables are also temporary, so it's not a good way to keep a permanent list of registered users.
The right way to keep a permanent list of users is in a database on the server.

Answer 2

using cookies with serialize and unserialize function
user.php
<?php
class User
{
public static $cnt = 0;
private $id;
private $name;
public function __construct($name='')
{
self::$cnt++;
$this->id = self::$cnt;
$this->name = stripslashes($name);
}
public function __get($name){
return $this->$name;
}
public function __set($name,$val){
$this->$name = stripslashes($val);
}
public function __toString(){
return 'user('.$this->id.", ".$this->name.")";
}
}
?>
db.php
<?php
class DB
{
public $users = [];
public function __construct()
{
$this->users = [];
}
public function __toString()
{
$str = "<ul>";
foreach ($this->users as $user)
$str .="<li>".$user."</li>";
$str .= "</ul>";
return $str;
}
}
?>
index.php
<?php
require_once('user.php');
$user1 = new User('Steve');
$user2 = new User('Everst');
require_once('db.php');
$databse = new DB();
$databse->users[] = $user1;
$databse->users[] = $user2;
setcookie('users', serialize($databse),time() + 3600,"/","",0);
echo $_COOKIE['users'];
?>
users.php
<?php
require_once('db.php');
require_once('user.php');
$databse = unserialize($_COOKIE['users']);
echo $databse;
?>

Answer 3

using session with JSON
implements the interface JsonSerializable
override the method jsonSerialize
user.php
<?php
class User implements JsonSerializable
{
public static $cnt = 0;
private $id;
private $name;
public function __construct($name='')
{
self::$cnt++;
$this->id = self::$cnt;
$this->name = stripslashes($name);
}
public function __get($name){
return $this->$name;
}
public function __set($name,$val){
$this->$name = stripslashes($val);
}
public function __toString(){
return 'user('.$this->id.", ".$this->name.")";
}
public function jsonSerialize() {
return array(
'id' => $this->id,
'name' => $this->name
);
}
}
?>
index.php
<?php
session_start();
include('user.php');
include('db.php');
$user1 = new User('Steve');
$user2 = new User('Everst');
$databse = new DB();
$databse->users[] = $user1;
$databse->users[] = $user2;
$_SESSION['database'] = JSON_encode($databse);//{"users":[{"id":1,"name":"Steve"},{"id":2,"name":"Everst"}]}
?>
users.php
<?php
session_start();
$databse = json_decode($_SESSION['database']);
foreach ($databse->users as $user)
echo $user->id." - ".$user->name."<BR>";
?>