HelloWorld.php

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<?php

declare(strict_types=1);

use ILIAS\UI\Implementation\Component\ComponentHelper;
use ILIAS\UI\Component\Component;

class HelloWorld implements Component
{
    use ComponentHelper;

    protected $greeting = 'Hello World!';

    public function withGreeting(string $greeting): self
    {
        $clone = clone $this;
        $clone->greeting = $greeting;
        return $clone;
    }

    public function getGreeting(): string
    {
        return $this->greeting;
    }
}