<?php
$start = strtotime('20016-02-05');
$end = strtotime('2016-04-05');
$start_m = new DateTime($_GET["fecha1"]);
$end_m = new DateTime($_GET["fecha2"]);
$start_m->modify('first day of this month');
$end_m->modify('first day of next month');
$interval = DateInterval::createFromDateString('1 month');
$period = new DatePeriod($start_m, $interval, $end_m);
print_r($date_range_m);
Warning: Undefined array key "fecha1" in /in/imXRG on line 5
Deprecated: DateTime::__construct(): Passing null to parameter #1 ($datetime) of type string is deprecated in /in/imXRG on line 5
Warning: Undefined array key "fecha2" in /in/imXRG on line 6
Deprecated: DateTime::__construct(): Passing null to parameter #1 ($datetime) of type string is deprecated in /in/imXRG on line 6
Warning: Undefined variable $date_range_m in /in/imXRG on line 13
Output for 8.0.0 - 8.0.30
Warning: Undefined array key "fecha1" in /in/imXRG on line 5
Warning: Undefined array key "fecha2" in /in/imXRG on line 6
Warning: Undefined variable $date_range_m in /in/imXRG on line 13
Notice: Undefined index: fecha1 in /in/imXRG on line 5
Notice: Undefined index: fecha2 in /in/imXRG on line 6
Notice: Undefined variable: date_range_m in /in/imXRG on line 13