fullcalendar multi day event is not displaying - yii

Question

I am using full calendar in yii,but full calendar is not showing any events when i set the events for more than one day(multi day events) but it will display the event when i set it only for one day ,actually i want to display attendance of a student for a month .(just go through my controller if a student is absent it will show a color and another for present,it is not showing any output when i set one day is present and another day is absent,another day is present in a month,but if i set one case ie absent/present/leave only for a day in a month it will show the output.
<?php $this->widget('ext.Efullcalendar.EFullCalendar', array(
'themeCssFile'=>'cupertino/theme.css',
'htmlOptions'=>array(
// you can scale it down as well, try 80%
//'onload'=>'.fullCalendar( "gotoDate", "12-12-2016" )'
),
'options'=>array(
'header'=>array(
'left'=>'prev,next,today',
'center'=>'title',
'right'=>'month,agendaWeek,agendaDay',
),
'events'=>$events // URL to get event
)));
?>
$.ajax({
success: function(events){
$('#yw0').fullCalendar('removeEvents');
$('#yw0').fullCalendar('addEventSource', events);
},
type: 'get',
url: '<?php echo $this->createUrl('renderattendance');?>',
cache: false,
data: {
year: year,
month: month,
},
dataType: 'json',
});
{
$month=$_GET['month'];
$year=$_GET['year'];
} $noofdays=cal_days_in_month(CAL_GREGORIAN,$month,$year);
$student_model=$this->loadModel();
$student_id=$student_model->id;
$events=array();
$att_array=Attendance::getParentAttendanceMonth($student_id,$month,$year);
//$att_array[]=array('date'=>'2016-09-01','f'=>'present');
//$att_array[]=array('date'=>'2016-09-02','f'=>'absent');//print_r($att_array);die;
foreach($att_array as $i=>$att)
{
switch($att->present)
{
case Attendance::ABSENT:
{
$events[$i]['title']='absent';
$events[$i]['start']=$att['date'];
$events[$i]['color']='#FA0000';
break;
}
case Attendance::PRESENT:
{
$events[$i]['title']='present';
$events[$i]['start']=$att['date'];
$events[$i]['color']='#43E8A6';
break;
}
case Attendance::LEAVE:
{
$events[$i]['title']='leave';
$events[$i]['start']=$att['date'];
$events[$i]['color']='#949fef';
break;
}
default:
{
$events[$i]['title']='n-a';
$events[$i]['start']=$att['date'];
$events[$i]['color']='#999999';
break;
}
}
echo CJSON::encode($events);
}
}