<?php
$start = new DateTime('2015-01-01');
$start->modify('first day of this month');
$end = date('yyyy-mm-dd');
$end->modify('first day of next month');
$interval = DateInterval::createFromDateString('1 month');
$period = new DatePeriod($start, $interval, $end);
foreach ($period as $dt) {
echo $dt->format("Y-m") . PHP_EOL;
}
Fatal error: Uncaught Error: Call to a member function modify() on string in /in/tp1EM:5
Stack trace:
#0 {main}
thrown in /in/tp1EM on line 5
Process exited with code 255.
Output for 5.6.0 - 5.6.28
Fatal error: Call to a member function modify() on string in /in/tp1EM on line 5
Process exited with code 255.
Output for 5.5.0 - 5.5.37
Fatal error: Call to a member function modify() on a non-object in /in/tp1EM on line 5
Process exited with code 255.