Also it's really bad practice because a parent class should not know about its child, the parent class do in fact have access to protected properties.

<?php

class A { public function test() { echo self::class . ':' . $this->foo; } }
class B extends A { protected $foo = 'bar'; }
(new B())->test(); // A:bar

?>

Do we want to fix the english version to reflect the reality ? or should we fix the french one not to advocate bad practices ?

This bug has been fixed in the documentation's XML sources. Since the
online and downloadable versions of the documentation need some time
to get updated, we would like to ask you to be a bit patient.

Thank you for the report, and for helping us make our documentation better.