The variable $sniffs seems to never exist, and therefore isset should always return false. Did you maybe rename this variable?
This check looks for calls to isset(...) or empty() on variables
that are yet undefined. These calls will always produce the same result and
can be removed.
This is most likely caused by the renaming of a variable or the removal of
a function/method parameter.
The variable $sniffs does not exist. Did you forget to declare it?
This check marks access to variables or properties that have not been declared yet. While PHP
has no explicit notion of declaring a variable, accessing it before a value is assigned
to it is most likely a bug.
This check looks for calls to
isset(...)
orempty()
on variables that are yet undefined. These calls will always produce the same result and can be removed.This is most likely caused by the renaming of a variable or the removal of a function/method parameter.