Print number of days between two given dates in PHP

Print number of days between two given dates in PHP

<?php
        $date1 = date('Y-m-d');
        $date2 = date('2009-10-1');

        $days = (strtotime($date1)-strtotime($date2)) / (60*60*24);

        $days = intval($days);
        echo "Number of days = ".$days."\n";
?>