'options' => ['multiple'=>true, 'placeholder' => 'Search for a city ...'], code example

Example 1: kartik select2

$form->field($model, 'attribute')->widget(\kartik\select2\Select2::classname(), [
                'data' => \yii\helpers\ArrayHelper::map(Model::find()->all(), 'id', 'username'),
                'options' => ['placeholder' => 'Tanlang', 'multiple' => false, 'required' => true],
                'theme' => \kartik\select2\Select2::THEME_KRAJEE,
                'size' => 'xs',

Example 2: select2 yii2

$ php composer.phar require kartik-v/yii2-widget-select2 "@dev"

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