Usage example of PHP7 anonymous class (code)

<?php
/**
 * Created by PhpStorm.
 * User: Itboot
 * Date: 2019/1/17
 * Time: 18:15
 */

class An
{
    private $num;
    protected $age = 15;
    public function __construct() {
        $this->num = 1;
    }
    protected function bar(): int {
        return 10;
    }

    public function drive() {
        return new class($this->num) extends An{
            protected $id;

            public function __construct($num) {
                $this->id = $num;
            }
            public function ea() {
                return $this->id + $this->age + $this->bar();
            }
        };
    }
}
echo (new An())->drive()->ea();