Date Period PHP - php

Question

I want to render dates period base on start date and end date, for example:
Input:
Start date: 30/12/2017
End date: 31/03/2017
Interval: every month
Output I want:
30/12/2017
30/01/2018
30/03/2018 (February is missing because it not have 30th)
There my code:
function period_days($start_date, $int, $end_date){
$begin = new DateTime( $start_date );
$end = new DateTime( $end_date );
$interval = DateInterval::createFromDateString($int);
$period = new DatePeriod($begin, $interval, $end->modify( '+1 day' ));
return $period;
}
echo period_days('30-12-2017', '1 month', '31-03-2018');
Result return wrong (3rd should be "2018-03-30"):
"2017-12-30 00:00:00"
"2018-01-30 00:00:00"
"2018-03-02 00:00:00"
Edit: Explain about Input:
Start date format can be '31/12/2017' or 'first Monday of January 2018' or 'third Tuesday of December 2017' or '28 December 2017' ...
Interval can be '1 day', '1 month', '2 months', '1 year' ...
End date format is d-m-Y '01/12/2018'
I use this function to add schedule recurring event, something like plugin The Event Calendar, you guys can see example on https://wpshindig.com/events/community/add

Answer 1

I could suggest you a work around.
Since DatePeriod breaks for February, we could get Year and month and append date separately. But this will only be working for one year.
Example :
function periodDays($start_date, $int, $end_date){
$begin = new DateTime($start_date);
$end = new DateTime($end_date);
$startDay = $begin->format("d");
$interval = DateInterval::createFromDateString($int);
$period = new DatePeriod($begin, $interval, $end);
foreach($period as $date){
echo $date->format("Y-m-") .$startDay. "<br>";
}
}