Сравнение дат в php

09.08.2015

$exp_date = "2006-01-16";
$todays_date = date("Y-m-d");

$today = strtotime($todays_date);
$expiration_date = strtotime($exp_date);

if ($expiration_date > $today) {
     $valid = "yes";
} else {
     $valid = "no";
}

#PHP