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.btn {

    transition: all 0.5s ease 0s;
}

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 <?= Html::a('Ausschreibung publizieren', ['create'], ['class' => 'btn btn-info']) ?>

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 <div class="col-xs-12 col-md-6"><?= Html::submitButton('Anmelden', ['class' => 'btn btn-success btn-block btn-lg ']) ?></div>

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<?= Html::a('Alle ' .$model->skill->skill . ' anzeigen', ['coach/faehigkeiten', 'id' => $model->id_skill], ['class' => 'btn']) ?>

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 public function actionUpdate($id)
    {
        $model = $this->findModel($id);

        if ($model->load(Yii::$app->request->post())) {

            if  (isset ($model->id_trainingslevel)) {
                $model->id_trainingslevel = implode(",", $model->id_trainingslevel);
            }

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public static function Checktoken($id) {

        $model = Tuser::find()->where(['password' => $id ])->count();

        if( $model  > 0 )  {

           return true;
        } else {
            return false;
        }

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 $form->field($model, 'termsofuse')->checkbox(['label' => Yii::t('app', 'I understand and agree to the <a href="#termsofuse">Terms of Use</a>.')])->label(false);

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<!--Or you could add a getDischargedLabel() function in your model :-->

public function getDischargedLabel()
{
return $this->discharged ? 'Yes' : 'No';
}

<!--And in your gridview :-->

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<?= GridView::widget([
                'dataProvider' => $dataProvider,
                'layout' => '{items}{pager}',
                'columns' => [

                    'bezeichnung',
                    [
                        'header' => 'Kategorie 2',
                        'value' =>    'kat2.bezeichnung',
                    ],

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<?php $this->registerMetaTag(['name' => $model->skill, 'content' => $model->beschreibung]); ?>