Explain what's wrong with requests?

Question

Yii

here is the query

$cat= Category::find()->where(['or',['parrent_category'=>0],['parrent_category'=>null]])->all();
var_dump($cat)

produces
null
I go to the debugger and take a query to the database from there

SELECT * FROM `category` WHERE (`parrent_category`=0) OR (`parrent_category` IS NULL)

I make it out through the same phpmyadmin I get at least 10 values. I make round eyes and do not understand what the problem is.
Please explain how it can be that a mysql query would return 10 values ​​and an ActiveRecord query would return none?

Answer 1

$cat= Category::find()->where(['or',['parrent_category'=>0],['is', 'parrent_category', null]])->all();

Answer 2

Good evening.

$cat= Category::find()->where(['or', 'parrent_category=0' ,'parrent_category is null'])->all();