获取某个时间段内，每个几天的日期

• 以下例子是没两天打印一次日期。

<?php
$dateStart = new \DateTime();

$dateInterval = \DateInterval::createFromDateString('-2 days');

$datePeriod = new \DatePeriod($dateStart,$dateInterval,30);
foreach ($datePeriod as $date){
    echo $date->format('Y-m-d');
    echo '<br>';
}


$begin = new DateTime( '2012-08-01' );
$interval = new DateInterval('P2D');
$daterange = new DatePeriod($begin, $interval ,15);

foreach($daterange as $date){
    echo $date->format("Y-m-d") . "<br>";
}

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