PHP: Loop through all months in a date range?

问题:

If I have a start date (say 2009-02-01) and an end date (say 2010-01-01), how can I create a loop to go through all the dates (months) in the range?

回答1:

Try

$start = $month = strtotime('2009-02-01');
$end = strtotime('2011-01-01');
while($month < $end)
{
     echo date('F Y', $month), PHP_EOL;
     $month = strtotime("+1 month", $month);
}

Mind the note http://php.net/manual/de/datetime.formats.relative.php

Relative month values are calculated based on the length of months that they pass through. An example would be "+2 month 2011-11-30", which would produce "2012-01-30". This is due to November being 30 days in length, and December being 31 days in length, producing a total of 61 days.

As of PHP5.3 you can use http://www.php.net/manual/en/class.dateperiod.php

回答2:

Example of DateTime, DateInterval and DatePeriod class combination :

$start = new DateTime('2009-02-01');
$interval = new DateInterval('P1M');
$end = new DateTime('2011-01-01');
$period = new DatePeriod($start, $interval, $end);

foreach ($period as $dt) {
    echo $dt->format('F Y') . PHP_EOL;
}

回答3:

The accepted answer is not the proper way.

I tried this snippet and it does not work properly. If your start date is the end of the month and the end date is the start of the 3rd month.

For example: 2014-08-31 - 2014-10-01

Expected should be.

• August
• September
• October

The better solution is:

$start    = new DateTime('2010-12-02');
$start->modify('first day of this month');
$end      = new DateTime('2012-05-06');
$end->modify('first day of next month');
$interval = DateInterval::createFromDateString('1 month');
$period   = new DatePeriod($start, $interval, $end);

foreach ($period as $dt) {
    echo $dt->format("Y-m") . "<br>\n";
}

Reference: How to list all months between two dates

回答4:

$start = strtotime('2011-09-01');
$end = strtotime('2013-12-01');
while($start < $end)
{
    echo date('F Y', $start) . '<br>';
    $start = strtotime("+1 month", $start);
}

回答5:

I like the simplicity of the accepted answer, but as 3s2ng, it doesn't always work. So I tweeked it like this:

    $start = strtotime('2009-02-01');
    $startmoyr = date('Y', $start) . date('m', $start);
    $end = strtotime('2013-12-01');
    $endmoyr = date('Y', $end) . date('m', $end);

    while ($startmoyr <= $endmoyr) {
        echo date("F Y", $start) . "<br>";
        $start = strtotime("+1month", $start);
        $startmoyr = date('Y', $start) . date('m', $start);
    }

回答6:

I have a method which is optimal in results :

$begin = new DateTime( '2014-07-14' );
$end = new DateTime( '2014-08-01' );
$end = $end->modify( '+1 month' );
$interval = DateInterval::createFromDateString('1 month');

$period = new DatePeriod($begin, $interval, $end);

foreach($period as $dt) {
    var_dump($dt->format( "m" ));
}

A plus for the method of @Glavic