<?php
	
class Foo {
	 protected function bar() {
		 echo __METHOD__ . "\n";
	}
}

class Baz extends Foo {
	
	function qux() {
		$this->bar(); // Baz extends Foo, so it inherits bar(), but it is not overriding it
                parent::bar();
	}
}

$baz = new Baz();
$baz->qux();

Foo::bar
Foo::bar