function get_mondays($date)
{
$start = new DateTime($date);
$month = $start->format('m');
while ($start->format('m') === $month)
{
yield $start;
$start->modify('+1 week');
}
}
foreach (get_mondays('2019-06-03') as $d) {
echo $d->format('Y/m/d'), PHP_EOL;
}