php_8/inherit/anonym_nested.php

<?php
class Container
{
    private $title = 'Класс Container';
    protected $id = 1;
    public function anonym()
    {
        return new class($this->title) extends Container
        {

            private $name;

            public function __construct($title)
            {
                $this->name = $title;
            }

            public function print()
            {
                echo "{$this->name} ({$this->id})";
            }
        };
    }
}

(new Container)->anonym()->print();