PHP - 获取一年中某一天某一天的所有日期[重复]

Question

This question already has an answer here:

• Getting all dates for Mondays and Tuesdays for the next year 4 answers

I have the following problem.

In the employees table I store the free days of the week that has an employee. For example The free days of John are always on Monday.

So, I want to get all the dates for a year that falls on Monday.

For example in this month (Today is the 24-05-2016) the dates are for Monday:

All this dates are on Mondays:
02-05-2016,
09-05-2016,
16-05-2016,
23-05-2016,
30-05-2016
 and so on.

Is there a way to do that in PHP?

Thanks

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Answer 1

The interval is always 7 days, so just work out the start date as a DateTime object for the first "monday" of the year, end date as a year from then, and use DatePeriod to loop through that date range with an interval of every 7 days

$startDate = new DateTime('2016-01-01');
$startDate->modify('first monday');
$endDate = clone $startDate;
$endDate = $endDate->add(new DateInterval('P1Y'));

$interval = new DateInterval('P7D');

$period = new DatePeriod($startDate, $interval, $endDate);
foreach ($period as $date) {
    echo $date->format('Y-m-d').PHP_EOL;
}

Adjust start and end dates to taste