logic error in yii2 when save to database - php

Question

the below coding might have logic error which I cannot identify since I'm not so good in logic.
public function actionSave()
{
//initiate connection
$request = Yii::$app->request;
if (Yii::$app->request->post())
{
//receive from POST, insert into $student
$student=Yii::$app->request->post('sudent');
//receive from POST, insert into $selection
$selection=Yii::$app->request->post('selection');
//looping foreach and set $student as $key
foreach ($student as $key => $value)
{
if($key==0 )
{
$check=$selection[$key];
}
elseif($key)
{
$check=empty($selection[$key])?'':$selection[$key];
}
else{
//don't know what to do here
}
$model=new Attendance();
if($check || $check==0)
{
$model->student_id=$value;
$model->attendance_check=1;
$model->attendance_date=time();
// $model->attendance_reason=$value;
$model->save();
}
else
{
$model->student_id=$value;
$model->attendance_check=0;
$model->attendance_date=time();
// $model->attendance_reason=$value;
$model->save();
}
}
}
else
{
//don't know what to do here
}
}
the flow is, when this controller receive from POST (checked box and some texfields) it will go to foreach and check if the checkbox==1 (means it is ticked) it wil insert to databse. if not, still insert into database but with value 0.
one from 7 checkbox i did not tick. so, in database 6 attendance_check will hold value 1 and 1 attendance_check hold value 0.
what i get? all hold value 1.
what are the error?
Thanks.
--update 22/3/2016--
the form view (named index.php)
<?php
use yii\grid\GridView;
use yii\data\ActiveDataProvide;
use yii\grid\CheckboxColumn;
use yii\helpers\Html;
use yii\widgets\ActiveForm;
use yii\helpers\Url;
//active form start
$form = ActiveForm::begin([
//send to 'key-in-attendance/save'
'action' => Url::to(['key-in-attendance/save']),
]) ?>
<?php
//keluarkan grifview
echo GridView::widget([
'dataProvider' =>$dataProvider,
'columns' => [
['class' => 'yii\grid\SerialColumn'],
'id',
'student_name',
'class_id',
//checkbox untuk kehadiran
['class' => 'yii\grid\CheckboxColumn',
'checkboxOptions'=>['style'=>'display: block;margin-right: auto;margin-left: auto;'],
'header' => Html::checkBox('selection_all', false, [
'class' => 'select-on-check-all pull-right',
'label' => '<span class="pull-left">Check Attend Only</span>',//pull left the label
]),
'checkboxOptions' => function ($data, $key, $index, $column)
{
return ['value' => $index];
}
],
//text box utk masukkan sebab tak hadir
[
'class' => 'yii\grid\DataColumn',
'label'=> 'Reason not attend',
'value' => function ($data)
{
return Html::textarea("reason".$data->id);
},
'format'=>'raw'
],
[
'class' => 'yii\grid\DataColumn',
'value' => function ($data)
{
return Html::hiddeninput("sudent[]",$data->id);
},
'format'=>'raw'
],
],
]);
?>
<!-- butang submit dan tutup active form -->
<div class="form-group">
<div class="col-lg-offset-1 col-lg-11">
<?= Html::submitButton('Submit', ['class' => 'btn btn-primary']) ?>
</div>
</div>
<?php ActiveForm::end() ?>
--update 23/3/2016--
selection that I made
in the database

Answer 1

Select is already going to be indexed by the ID of your data provider, so the sudent array is unnecessary.
The following should work.
public function actionSave()
{
//initiate connection
$request = Yii::$app->request;
if (Yii::$app->request->post())
{
//receive from POST, insert into $selection
$selection=Yii::$app->request->post('selection');
//looping foreach and set $student as key
foreach ($selection as $value => $check)
{
$model=new Attendance();
$model->student_id=$value;
$model->attendance_check=$check ? 1 : 0;
$model->attendance_date=time();
// $model->attendance_reason=$value;
$model->save();
}
}
else
{
//don't know what to do here
}
}
One more thing to consider is that you are creating new Attendance records but responses might already have been recorded, you want to load first.
$model = Attendance::findOne(['student_id'=>$value]);
if(!$model) $model = new Attendance();