gistfile1.php

<?php

class Father {
    private   $fProperty;

    public function setProp($fProperty) {
        $this->fProperty = $fProperty;

        return $this;
    }

    public function __construct() {
        $this->setProp('parent');
    }

}

class Child extends Father {
    public function __construct() {
        parent::__construct();
    }
}


$father =  new Father();
var_dump($father);



$child =  new Child();
var_dump($child);

?>