<?php
class User {
    public $firstName;
    public $lastName;
    public $userName;

    protected $regID =  1001;
    private $level = 'User';

    public function fullName(){
        return $this->firstName.' '.$this->lastName;
    }

    protected function sayProtect(){
        return "Hello, Protected";
    }

    private function sayPrivate(){
        return "Hello, Private";
    }

}
class Customer extends User{
    public function sayParent(){
        return $this->sayProtect();
    }
}
$u = new User;
$u->firstName = 'User';
$u->lastName = 'Class';
echo $u->regID."<br/>";
echo $u->level."<br/>";

echo $u->fullName()."<br/>";
echo $u->sayProtect()."<br/>";
echo $u->sayPrivate()."<br/>";

$c = new Customer;
$c->firstName = 'Customer';
$c->lastName = "Dani";
echo $c->fullName()."<br/>";
echo $c->sayParent()."<br/>";



?>