<?php

class Holder
{
    const myConstant = 'Stabil';
}

class Wrapper
{
    public $holder;

    public function __construct(Holder $holder)
    {
        $this->holder = $holder;
    }
}

$holder = new Holder();
$wrapper = new Wrapper($holder);

echo $holder::myConstant;
// 'Stabil'

$holder2 = $wrapper->holder;
echo $holder2::myConstant;
// 'Stabil'

echo $wrapper->holder::myConstant;
// PHP Parse error:  syntax error, unexpected T_PAAMAYIM_NEKUDOTAYIM, expecting
// ',' or ';' in /home/tobias/phpwtf.php on line 24