anon-class-use.php

<?php

$hello = 'Hello';
$world = 'World';

$speaker = new class use ($hello as public, $world as private $who) {
    public function say() : void
    {
        echo $this->hello . ' ' $this->who, PHP_EOL;
    }
};

$speaker->say(); // Hello World

$speaker->hello = 'Hola';
$speaker->say(); // Hola World

$speaker->who = 'Mundo'; // visibility error
$speaker->say();