//view////////////////////////////////////////////////////////////////////////////////////////////////////////
<?php

use yii\helpers\Html;
use yii\widgets\ActiveForm;


?>
<div class="ajax">

    <?php $form = ActiveForm::begin(); ?>

        <?= $form->field($model, 'text') ?>
    <div id="my"></div>
        <div class="form-group" id="my">
            <?= Html::submitButton('Submit', [
                    'class' => 'btn btn-primary',
                    'name' => 'contact-button',
                    'onclick'=>'$.ajax({
                        url: "http://localhost/basic/web/index.php?r=ajax/ajax",
                        type: "post",
                        data: "555555555555555",
                        success: function(response) {document.getElementById("my").innerHTML = document.getElementById("my").innerHTML+"Hello Dolly."+date;
                        },
                        error: function(response) {alert("не заебись")}
                    })'


                    ]) ?>
        </div>
    <?php ActiveForm::end(); ?>


</div><!-- ajax -->
///AjaxController////////////////////////////////////////////////////////////////////////////////////////////////////////////////
<?php

namespace app\controllers;
use Yii;
class AjaxController extends \yii\web\Controller
{


    public function actionIndex()
    {
        $model = new \app\models\ajax();

        if ($model->load(Yii::$app->request->post())) {
            if ($model->validate()) {
                // form inputs are valid, do something here
                return 1;
            }
        }

        return $this->render('index', [
            'model' => $model,
        ]);
}


public function actionAjax()
    {

$n = array('min' => date("i"), "sec" => date("s"));
    echo json_encode($n);


        //$model = new \app\models\ajax();
        //$link = mysqli_connect("localhost", "root", "", "yii");if (mysqli_connect_errno()) {printf("Не удалось подключиться: %s\n", mysqli_connect_error());exit();} else echo 'подключились';
        //$link->set_charset("utf8") ;
        //$a='fgjgfhjfghj';
        //$insert = mysqli_multi_query($link,"INSERT INTO `yii`.`ajax` (`id`, `text`) VALUES (NULL, '$a')")or die (mysqli_error($link));


    }






}


///////////////models///////////////////////////////////////////////////////////////////////
<?php

namespace app\models;

use Yii;

/**
 * This is the model class for table "ajax".
 *
 * @property integer $id
 * @property string $text
 */
class Ajax extends \yii\db\ActiveRecord
{
    /**
     * @inheritdoc
     */
    public static function tableName()
    {
        return 'ajax';
    }

    /**
     * @inheritdoc
     */
    public function rules()
    {
        return [
            [['text'], 'required'],
            [['text'], 'string']
        ];
    }

    /**
     * @inheritdoc
     */
    public function attributeLabels()
    {
        return [
            'id' => 'ID',
            'text' => 'Text',
        ];
    }
}