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Helpers

HTML::a
// both the same
return Html::a($data->naam, ['/examen/update?id='.$data->id],['title'=> 'Edit',]);
return Html::a($data->naam, ['/examen/update', 'id'=>$data->id], ['title'=> 'Edit',]);

// back
 <?= Html::a( 'Cancel', Yii::$app->request->referrer , ['class'=>'btn btn-primary']); ?>
Array helper
use yii\helpers\ArrayHelper;

$dropdownlist = Arrayhelper::map($student,'id','naam');

//input [ [ 'id' => '999', 'naam' => 'Mark de Groot'], [ 'id' => ..... ], [ ....], ....]
//result [ '999' => 'Mark de Groot', ...];
echo Html::a("<span style=\"color:#800000\" class=\"glyphicon glyphicon-print\"></span>",
   ['print/index', 'id'=>-99],
     [  'title' => 'Print ALL',
        'data' => [
        'confirm' => 'Are you sure you want to print this item?',
        'method' => 'post',
     ],
   ] );
Html::a("<span class=\"glyphicon glyphicon-trash\"></span>",
	['/uitslag/remove', 'studentid'=>$dataSet[$naam]['studentid'], 'examenid'=>$examenid ],
	['data-confirm' => 'Delete all results from '.$naam.' from this exam?', 'title'=> 'Verwijder uitslag']);

Html::a( [naam], [link, parameter, parameter], [options] )
Options in het bovenstaande voorbeeld: data-confirm en title. Andere option is class

Yii::$app

 Yii::$app->requestedRoute;          // route, example query/help
 Yii::$app->controller->action->id   // action, example help
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