How to check if a checkbox is checked in yii2?

Question

Yii

Hello!
How can I set a rule that requires that some checkbox ("acceptRules") be checked?
Now I'm using the IN validator with valid values ​​[1].
Thank you!

Answer 1

I solved it like this:
['checkbox', 'required', 'requiredValue' => 1]

Answer 2

Extended version:

[['is_checked'], 'required'],
  [['is_checked'], 'boolean'],
  [['is_checked'], 'default', 'value' => true],