php - Inheritance: how to properly set global vars in OOP architecture without using $GLOBALS -

i'm building mvc framework scratch fun , learning purpose.

what i'd have conf file configuration params (host, default language, current language, etc.) , have params available in every script of framework without using $globals. it's couple of month i'm oop so, make simpler, idea has been create class private properties, create protected function env() subclasses can retrieve properties , put class @ top level in hierarchy letting other class extending or other subclasses.

class environment {     private $full_url     = "https://www.example.com";     private $relative_url = "test";     private $default_lang = "en";     private $current_lang;     private $admin_area   = "admin";     private $user_area    = "user";      function __construct()     {         $this->setcurrentlang();     }      private function setcurrentlang()     {         $this->current_lang = "it";     }      protected function env($var)     {         if (isset($this->$var)) {             return $this->$var;         } else {             echo "environment variable <strong><em>$var</em></strong> not found in <strong>" . __file__ . "</strong> on line <strong>" . __line__ . "</strong>." . php_eol;         }     } } 

this method worked until set __construct() method in subclasses also. problem subclasses need independent constructors but, if don't call parent::construct(), environment class' constructor not called , param $current_lang not set.

this bad design want achieve so, keeping in mind goal, have suggestion?

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to thorough, general designed planned one:

• environment top class
• router extends environment (router receives requests , set var $request should used other sub classes)
• in __construct() router loads , instantiates controller, extends router
• then controllers, examplecontroller, extend controller
• the same happens model, extends router, , subclasses e.g. examplemodel extends model

at point, how can retrieve private params contained in environment set inside contstructor without calling parent::construct() in each sub-class?

i hope explained problem.