Comparando condicionalmente duas datas

comparison_of_two_dates.php

<?php

$now = new DateTime();
$today = new DateTime('today');
$yesterday = new DateTime('yesterday');
$tomorrow = new DateTime('tomorrow');

if ($now >= $today) {
	echo $now->format('d/m/Y H:i:s') . ' it greater ' . $today->format('d/m/Y H:i:s') . PHP_EOL;
}

if ($yesterday <= $tomorrow) {
	echo $yesterday->format('d/m/Y H:i:s') . ' it smaller ' . $tomorrow->format('d/m/Y H:i:s') . PHP_EOL;
}

if ($today != $tomorrow) {
	echo $today->format('d/m/Y H:i:s') . ' is different from ' . $tomorrow->format('d/m/Y H:i:s');
}