- var_dump: documentation ( source)
<?php
$period =
new DatePeriod(
new DateTimeImmutable('2017-07-01'),
new DateInterval('P1D'),
(new DateTimeImmutable('2017-07-10'))->modify('+1 day')
);
foreach ($period as $day) {
var_dump($day->format('Y-m-d'));
}