`print_r` should report error in concat and missing `return` parameter

### Feature request

it would be valuable to get an error in the following snippet because the code is missing the 2nd arg `true` to `print_r`.


https://phpstan.org/r/23efd5de-4025-408c-bffd-0f1aa35778a2

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