php check if given date has passed or is tomorrow or is today or in the future

<?php

$date = '2020-09-01';

echo date_passed($date);

function date_passed(string $date)
{
    $now = new \DateTime('now');
    $date = new \DateTime($date);

    if($date->diff($now)->invert === 1) {
        return 'has passed';
    } else if ($date->diff($now)->days === 0) {
        return 'is today';
    } else if ($date->diff($now)->days === 1) {
        return 'is tomorrow';
    } else {
        return 'is in the future';
    }
}