Dynamic multiple check box based depdrop

I have an active form instance which is showing form fields based on depdrop of Karthik


 <?= $form->field($model, 'country')->dropDownList(Countries::getCountries(),

                    ['id' => 'country_id', 'prompt' => 'Select  countries'])

                ?>

Then


                <?= $form->field($model, 'state')->widget(DepDrop::classname(), [

                        //'data' => Regions::getRegions($model->country),

                        'options' => ['id' => 'region_id', 'prompt' => 'Choose a country first'],

                        'pluginOptions' => [

                            'depends' => ['country_id'],

                            'placeholder' => 'Select a state',

                            'url' => Url::to(['/regions/regions'])

                        ]

                    ]) ?>

Then


  <?= $form->field($model, 'city')->widget(DepDrop::classname(), [

                        //'data' => Cities::getCities($model->country),

                        'options' => ['id' => 'city_id', 'prompt' => 'Select a state'],

                        'pluginOptions' => [

                            'depends' => ['country_id','region_id'],

                            'placeholder' => 'Select',

                            'url' => Url::to(['/cities/cities'])

                        ]

                    ]) ?>

Then


            <?= $form->field($model, 'publisher_name')->widget(DepDrop::classname(), [

                    //'data' => Cities::getCities($model->country),

                    'options' => ['id' => 'user_id', 'prompt' => 'Choose a publisher'],

                    'pluginOptions' => [

                        'depends' => ['country_id','region_id','city_id'],

                        'placeholder' => 'Select',

                        'url' => Url::to(['/publisher/publishers'])

                    ]

                ]) ?>

Everything is working perfectly at the last part instead of drop down i want to show check box for example it is returning a json code


{"output":[{"user_id":"109","name":"user1"},{"user_id":"114","name":"user2"}],"selected":""}



I want to generate a checkbox based on this json code how can I do that