At creation textInput attributes are automatically appropriated. How to fix?

Question

Yii

Good afternoon.
Automatically assigns attributes to a text input field.
I pass two values ​​id, form through the controller

public function actionBlock() {
        $form = new BlockForm;
        $id = Yii::$app->request->get();

        return $this->render('block', [
                'form' => $form,
                'id' => $id,
            ]);
    }

in view

$f = ActiveForm::begin();

                    $f->field($form, 'reason', [
                    'template' => '
                        <div class="form-group has-feedback">
                            <label>Почтовый адрес</label>
                            {input}
                            <i class="icon-users form-control-feedback"></i>
                            {error}
                        </div>'
                ])->textInput([
                    'class' => 'form-control',
                    'placeholder' => 'Почтовый адрес'
                ])->label(false); 
ActiveForm::end();

I have a hidden text field in the output

<input type="hidden" name="_csrf" value="VEFEVVpvMHkHJ3VkFzV6Kzt4cTwgP0lLEhEoZT47ckx5dSgmCRhKCQ==">

What is causing all this assignment?

Answer 1

Good evening.
This field is added for security reasons. Don't worry, everything is fine, as it should be. The form without this will not go to the server.
What is csrf