<?php

class ParentClass {

    protected $foo = "bar";

    public function __construct()
    {
        $this->foo = "baz";
    }
}


class Child extends ParentClass {

    public function __construct()
    {
        //
    }

    public function getFoo()
    {
        return $this->foo;
    }
}


$child = new Child;

// co bude zobrazeno na vypisu?
echo $child->getFoo();