Best practice to show user data in PHP -

this user class getting user data.

require_once "classes/db.php";  class user {      private $session_user_id = 1;     //$session_user_id = $_session["user_id"];      private $user_data;     public $username;     public $first_name;     public $last_name;     public $profile_photo;      private static $instance = null;      //kthen objekt.     private function __construct() {         $db = db::get_instance();         $query = "select * `users` `user_id` = $this->session_user_id";         $run_query = $db->mysqli->query($query);         $this->user_data = $run_query->fetch_assoc();          $this->username = $this->user_data["username"];         $this->first_name = $this->user_data["first_name"];         $this->last_name = $this->user_data["last_name"];         $this->profile_photo = $this->user_data["profile"];     }      public static function get_instance() {         if(!isset(self::$instance))             self::$instance = new self;          return self::$instance;     }          public function first_name() {         return $this->first_name;     }  }  $user = user::get_instance(); 

can tell me best method make private properties , content using public get_name(); method echo $user->get_last_name()?

or echo property content? echo $user->last_name.

extra question: how can use $_session variables inside class? should pass function parameter?

firstly, should view popular framework designs $_session question.

in opinion, it's better use getter , setter methods object-oriented approach. because these variables cannot modified outside when compared direct call of variables class. also, can use protected variables better privates.

you can read these topics stack overflow:

why use getters , setters?

what point of getters , setters?