Ad Scheduling in PHP - 2015

[Doug Silksone]

Hey guys - First post here.

Purpose of this code section is to set Ad Scheduling between 00:00 - 04:00 every weekday. Unfortunately, the code I've written has been breaking the rest of my PHP script. 
At first glance, can you see where I'm going wrong? 

$campaignCriterionService =   $user->GetService('CampaignCriterionService', ADWORDS_VERSION);

  $operations = array();
  $campaignID = "XXX-XXX-XXXXX";
  $days = array(
  'MONDAY',
  'TUESDAY',
  'WEDNESDAY',
  'THURSDAY',
  'FRIDAY'
  );
 
 foreach($days as $day) {
 //Set Variables
 $adSchedule = new AdSchedule();
 $adSchedule->dayOfWeek = $days[i];
 $adSchedule->startHour = 0;
 $adSchedule->startMinute = 'ZERO' ;
 $adSchedule->endHour = 4;
 $adSchedule->endMinute = 'ZERO' ;
 
 $adScheduleCriterion = new AdScheduleCriterion();
 $adScheduleCriterion->campaignId = $campaignID;
 $adScheduleCriterion->criterion = $adSchedule;
 
 $adScheduleCriteria[] = $adScheduleCriterion;
 //Create the Operation
 $operation = new CampaignCriterionOperation();
 $operation->operand = $adScheduleCriterion;
 $operation->operator = 'ADD';
 $operations[] = $operation;
 
 }
 //Mutate!
  $result = $CampaignCriterionService->mutate($operations);

[tam...@brainlabsdigital.com]

 $adSchedule->dayOfWeek = $days[i];

Should this say $day rather than $days[i]?