} class SubVisibility extends Visibility { public function callPro() { $this->pub(); $this->pro(); //$this->pri(); // fatal } } $foo = new Visibility(); $bar = new SubVisibility(); echo $foo->public . PHP_EOL; //echo $foo->protected.PHP_EOL; // fatal //echo $foo->private.PHP_EOL; // fatal $foo->pub(); //$foo->pro(); // fatal //$foo->pri(); // fatal $bar->callPro(); // iterators class IterableClass { public $name = "foo"; public $surname = "bar"; public static $age = 10; public function test() { echo "Hey dude!" . PHP_EOL; } } $ic = new IterableClass();