Yii2：选择dropDownList上没有扩展名的所有选项

Question

How can I add to the dropDowList the option to select all without using an extension? I need to be able to mark one or all at once, in the image I show how it should look.

I have this code:

<?php

   echo CHtml::dropDownList('client', '', (array) $all_client, array(
        'empty' => 'Select All',
        'class' => "form-control selectpicker",
        'id' => "f_client",
        'style' => "width: 150px;",
        'data-live-search' => "true",
        'onchange' => 'myFunction()',
        'multiple' => 'multiple'
    ));

 ?>

Answer 1

I forget to publish the answer, it may be useful to another person. Using the bootstrap select plugin I just had to add:

'data-actions-box' => 'true' 

and it worked perfect