function createDateRangeArray($strDateFrom,$strDateTo)
{
// takes two dates formatted as YYYY-MM-DD and creates an
// inclusive array of the dates between the from and to dates.

// could test validity of dates here but I'm already doing
// that in the main script

$aryRange=array();

$iDateFrom=mktime(1,0,0,substr($strDateFrom,5,2), substr($strDateFrom,8,2),substr($strDateFrom,0,4));
$iDateTo=mktime(1,0,0,substr($strDateTo,5,2), substr($strDateTo,8,2),substr($strDateTo,0,4));

if ($iDateTo>=$iDateFrom)
{
array_push($aryRange,date('Y-m-d',$iDateFrom)); // first entry
while ($iDateFrom<$iDateTo)
{
$iDateFrom+=86400; // add 24 hours
array_push($aryRange,date('Y-m-d',$iDateFrom));
}
}
return $aryRange;
}

EX usage:

$fromDate = '2017-07-01';
$toDate = '2017-07-03';

//Create Date range
$dateDay = createDateRangeArray($fromDate,$toDate);

//Initialize all data to 0
foreach($dateDay as $tmp){
$arraydate[$tmp]['total_distinct'] = 0;
$arraydate[$tmp]['total'] = 0;
}