OO PHP Accessing public variable from another class

Question

I have a class like the following:

class game {

    public $db;
    public $check;
    public $lang;

    public function __construct() {

        $this->che         


        

Answer 1

if you mark the public $lang; as static:

public static $lang;

you can access it via game::$lang;

if not static, you need to make an instance of game and directly access it:

$game = new game;
$game->lang;

static call inside of (current) class:

self::$lang;

late static bound call (to inherited static variable):

static::$lang;

call from child class to parent:

parent::$lang;

normal call inside of an instance (instance is when you use new Obj();):

$this->lang;

BTW: variables defined by define('DEFAULT_LANG', 'en_EN'); are GLOBAL scope, mean, can access everywhere!