Why is Yii:$app bad?

Question

Yii

From the point of view of OOP
, you will not find this in a symphony.

Answer 1

This is the Service Locator antipattern.
Hiding dependencies, hard dependency on this SL, violation of encapsulation makes it difficult to work with static analysis tools.

you don't see that in the symphony.

You need to understand that these frameworks have different goals and objectives. Yii is better compared to Laravel, and in Laravel there is enough of this ("facades").

Answer 2

Obviously, the fact that it can be used in any context, as a global variable.