- print_r: documentation ( source)
<?php
$startPointer = new DateTime('2015-04-01');
$endPointer = new DateTime('2015-04-01');
print_r($startPointer);
print_r($endPointer);
$step = new DateInterval('P1D');
$startPointer->add($step);
$endPointer->add($step);
print_r($startPointer);
print_r($endPointer);