<?php
 
function get_recurring($recurring_day, $start_datetime, $end_datetime, $now) {
	if ($recurring_day) {
		$w = $now->format('l');
		$w = strtolower($w);
 
		$new_datetime = $now;
		if ($w != $recurring_day) {
			$new_datetime = $now->modify('next '.$recurring_day);
		}
		$new_datetime = $new_datetime->setTime($start_datetime->format('G'), $start_datetime->format('i'));
 
		$period = new DatePeriod($new_datetime, new DateInterval('P7D'), 6);
		$count = 0;
		foreach ($period as $date) {
			if ($date > $now && $date <= $end_datetime) {
				yield [
					true,
					$date,
					$end_datetime ? $date->setTime($end_datetime->format('G'), $end_datetime->format('i')) : null,
				];
				$count++;
				if ($count >= 4) {
					return;
				}
			}
		}
		return;
	}
	yield [
		false,
		$start_datetime,
		$end_datetime,
	];
}
 
foreach (get_recurring('tuesday', DateTime::createFromFormat('d.m.Y G:i', '01.10.2024 9:30'), DateTime::createFromFormat('d.m.Y G:i', '17.12.2024 10:30'), new DateTime()) as $datetime) {
	var_export($datetime);
	echo "\n";
}

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