What's wrong with begin() end() in a widget?

Question

Yii

What I can't imagine.
Divided your widget into

<?= HamburgerMenu::begin(['options' => ['class' => 'header__menu', 'buttonClass' => 'menu__button', 'id' => 'menu_button']])?>
  <?= HamburgerMenu::end()?>

(I want to place the Menu widget call inside)
And I get the error Object of class app\widgets\HamburgerMenu could not be converted to string
If you just call the widget (without begin, end), then everything works fine.
What does he want to see in a line there?

Answer 1

<?= foo?> This is the same as <? echo foo ?>
you probably need to remove the equal sign after the question