How to display part of text in Yii2?

Question

Yii

With the help of active record, using the following code - , we display the text of the post from the database. How to make Yii2 output only part of the text? For example, only 400 characters. <?= $orders->post ?>

Answer 1

\yii\helpers\StringHelper::truncate('Текст который нужно обрезать',150,'...');

Answer 2

php.net/manual/en/function.mb-substr.php