yii2 使用心得之表单及表单的类设置

<?php
    use yii\helpers\Html;
    use yii\widgets\ActiveForm;


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

        <?= $form->field($search, 'text')->textInput(['class' => 'search-input']) ?>

        <div class="button-group"><?= Html::submitButton('搜索'); ?></div>

<?php
        ActiveForm::end();
?>