- printf: documentation ( source)
<?php
$this_monday = new DateTime('Monday this week');
$next_monday = new DateTime('Monday next week');
$interval = new DateInterval('P1D');
$datePeriod = new DatePeriod($this_monday, $interval, $next_monday);
foreach($datePeriod as $day) {
printf("%s | %s<br>\n", $day->format('l'), $day->format('d-m-Y'));
}