カレンダーっぽい感じのあれ

gistfile1.php

<?php

function getCalendar($date) {
    if ($date instanceof DateTime === false) {
        $date = new DateTime($date);
    }

    $sdate = clone $date;
    $sdate->modify('first day of');

    $edate = clone $sdate;
    $edate->modify('+1 month');

    if ($sdate->format('w')) {
        $sdate->modify('last sunday');
    }

    if ($edate->format('w')) {
        $edate->modify('next sunday');
    }

    $period = new DatePeriod(
        $sdate,
        new DateInterval('P1D'),
        $edate
    );

    return $period;
}

foreach (getCalendar(new DateTime('+1 month')) as $k => $d) {
    if ($k !== 0 && $k % 7 === 0) {
        echo PHP_EOL;
    }
    echo $d->format("\td");
}