throw new \Exception('请求异常');

yii-select2

 <?php
                echo $form->field($model, 'come_from')
                    ->widget(\kartik\select2\Select2::classname(), [
                    'options' => [
                        'multiple' => true //可进行多选
                        'placeholder' => '请输 ...'
                    ],
                   'data' => ClientChannel::getChannelList(), //返回值为数组  
                   // 'data' => ArrayHelper::merge([
                //    '' => '全部'
              //  ], UserAchievementCate::USER_STATUS),   合并数组      

                   'pluginOptions' => [
                        'allowClear' => true,
                        'escapeMarkup' => new \yii\web\JsExpression('function (markup) { return markup; }'),
                        'templateResult' => new \yii\web\JsExpression('function(res) { return res.text; }'),
                        'templateSelection' => new \yii\web\JsExpression('function (res) { return res.text; }')
                    ]
                ])
                    ->label('来源渠道');
                ?>

<?php
    echo $form->field($model, 'title')->widget(Select2::classname(), [
        'options' => ['placeholder' => '请输入标题名称 ...'],
        'pluginOptions' => [
            'placeholder' => 'search ...',
            'allowClear' => true,//允许清除搜索条件
            'language' => [
                'errorLoading' => new JsExpression("function () { return 'Waiting...'; }"),
            ],
            'ajax' => [
                'url' => '提供数据源的接口',
                'dataType' => 'json',
                'data' => new JsExpression('function(params) { return {q:params.term}; }')
            ],
            'escapeMarkup' => new JsExpression('function (markup) { return markup; }'),
            'templateResult' => new JsExpression('function(res) { return res.text; }'),
            'templateSelection' => new JsExpression('function (res) { return res.text; }'),
        ],
    ]);
?>