Online PHP editor | output for SlEJc

@ 2019-05-28T16:07:31Z

<?php

$from = new DateTime('2014-01-29');
$day = $from->format('j');
$from->modify('first day of this month'); //2014-01-01

$period = new DatePeriod($from, new DateInterval('P1M'), 12);
foreach ($period as $date) {
    $lastDay = clone $date;
    $lastDay->modify('last day of this month');
    $date->setDate($date->format('Y'), $date->format('n'), $day);
    if ($date > $lastDay) {
       $date = $lastDay;
    }
    echo $date->format('Y-m-d') . \PHP_EOL;
}

Output for 7.1.25 - 7.1.28, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.28, 8.4.1 - 8.4.14, 8.5.0: 2014-01-29 2014-02-28 2014-03-29 2014-04-29 2014-05-29 2014-06-29 2014-07-29 2014-08-29 2014-09-29 2014-10-29 2014-11-29 2014-12-29 2015-01-29
Output for 8.4.15: /bin/php-8.4.15: /usr/lib/libm.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libm.so.6: version `GLIBC_2.35' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libc.so.6: version `GLIBC_2.34' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libc.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.4.15)
Process exited with code 1.

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