Online PHP editor | refs for 5P8kU

@ 2021-09-19T00:09:27Z

<?php

$sunday = new DateTimeImmutable('Sunday');
for ($dow = 0; $dow <= 6; $dow++) {
    $weekday = $sunday->add(new DateInterval('P'. $dow .'D'));

    printf('%s = %s (%s)' . PHP_EOL, $dow, $weekday->format('l'), $weekday->format('D'));
}