The 8.4 release of PHP added logic so if we're creating a class and then immediately calling a helper function inside the class the class initialization no longer needs to be in parenthsis.

<?php
class User
{
    public function doSomething(): void
    {
        echo "This is something", PHP_EOL;
    }
}

// pre-8.4
(new User())->doSomething();

// post-8.4
new User()->doSomething();

Want to Know More?

I did a whole article for php[achitect] on fun new features in PHP 8.4 where I got into more details. It's also available in a video version if you're so inclined.