Where does the DataProvider get this behavior from?

Question

Yii

There is code, standard, generated by GII, shortened for convenience:

$query = SomeModel::find();
        $dataProvider = new ActiveDataProvider([
            'query' => $query,
        ]);

        $query->andWhere(' 1 = 0');
        return $query;

How can the line $query->andWhere('1 = 0'); if $query has already been passed to the constructor in the line above, and the constructor takes a value, not a reference? What's the magic?

Answer 1

query is an object. Roughly speaking - objects are passed by reference in PHP. To be more precise, the variable object in fact is always not the object itself, but a reference to it.