Error: Undefined offset: 1 - well, now how to find the cause of the error?

Question

Yii

I run the script in the console, something like this
/console-script controller/action
I get an error:
Error: Undefined offset: 1
Is this a joke? How to find the line and, accordingly, the cause of the error?
There is nothing in the php log.

Answer 1

The reason for the error is already indicated by you: you are accessing a non-existent array element.
Forget about the existence of errors, and smeared with exceptions.
Validate input in every method, always.
The easiest way to find a bug is with xdebug