yii2/docs/guide/helper-overview.md

Helpers

Note: This section is under development.

Helper classes typically contain static methods only and are used as follows:

use \yii\helpers\Html;
echo Html::encode('Test > test');

There are several classes provided by framework:

• ArrayHelper
• Console
• FileHelper
• Html
• HtmlPurifier
• Image
• Inflector
• Json
• Markdown
• Security
• StringHelper
• Url
• VarDumper