Online PHP editor | output for h06uQ

@ 2016-01-05T18:56:21Z

<?php

$firstAvailableCount = 100;
$slice = 'weekly';
$countData = array();

$startDateTime = new DateTime("2016-01-10");
$endDateTime = new DateTime("2016-01-12");

fillCountMapPeriod($startDateTime,$endDateTime,$countData,$firstAvailableCount,$slice);

function fillCountMapPeriod( DateTime $startDateTime, DateTime $endDateTime, array $countData, $firstAvailableCount, $slice) {
    
    if($slice == 'monthly') {
      $interval = new DateInterval('P1M');
      $format = 'm-Y';
      $startDateTime = DateTime::createFromFormat($format."-d",$startDateTime->format($format).-"1");
      $endDateTime = DateTime::createFromFormat($format."-d",$endDateTime->format($format).-"1");
    } else {
      $interval = new DateInterval('P1W');
      $format = 'W-Y';
      $startDateTime = DateTime::createFromFormat($format,$startDateTime->format($format));
      $endDateTime = DateTime::createFromFormat($format,$endDateTime->format($format));
      var_dump($startDateTime);
      var_dump($endDateTime);
    }
   
    if($startDateTime->format($format) == $endDateTime->format($format)) {
        var_dump($startDateTime->format($format));
        return;
    }

    //var_dump($endDateTime);
    while($startDateTime <= $endDateTime){
        var_dump($startDateTime->format("d-".$format));
        $startDateTime->add($interval);
    }
}

Output for 8.3.0 - 8.3.6: bool(false) bool(false) Fatal error: Uncaught Error: Call to a member function format() on false in /in/h06uQ:28 Stack trace: #0 /in/h06uQ(10): fillCountMapPeriod(false, false, Array, 100, 'weekly') #1 {main} thrown in /in/h06uQ on line 28
Process exited with code 255.
Output for 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18: bool(false) bool(false) Fatal error: Uncaught Error: Call to a member function format() on bool in /in/h06uQ:28 Stack trace: #0 /in/h06uQ(10): fillCountMapPeriod(false, false, Array, 100, 'weekly') #1 {main} thrown in /in/h06uQ on line 28
Process exited with code 255.
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33: bool(false) bool(false) Fatal error: Uncaught Error: Call to a member function format() on boolean in /in/h06uQ:28 Stack trace: #0 /in/h06uQ(10): fillCountMapPeriod(false, false, Array, 100, 'weekly') #1 {main} thrown in /in/h06uQ on line 28
Process exited with code 255.
Output for 5.6.8 - 5.6.28: bool(false) bool(false) Fatal error: Call to a member function format() on boolean in /in/h06uQ on line 28
Process exited with code 255.
Output for 5.5.24 - 5.5.35: bool(false) bool(false) Fatal error: Call to a member function format() on a non-object in /in/h06uQ on line 28
Process exited with code 255.

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