phpstan test class

HelloWorld.php

<?php declare(strict_types = 1);

/**
 * phpstan sample
 *
 * Class HelloWorld
 * @package App
 */
class HelloWorld
{
    public function sayHello(DateTimeImutable $date): void
    {
        echo 'Hello, ' . $date->format('j. n. Y');
    }

    /**
     * @param int $name
     */
    public function sayWorld(string $name): array
    {
        return 'Hello, ' . $name;
    }
}