Is it necessary to dress all variables in the class with properties?

Question

PHP

There is a class. It has many methods. Let's say there is a certain method that uses two class properties that are used in no other method. Let it, for example, return some result and operate on two variables.
Do these two variables need to be declared as class properties, or can they be left as dynamic variables? Or is it already a bad tone?

Answer 1

bad form is to create confusion where it could be dispensed with.
if variables are needed for local work, then there is no need to take them out anywhere.
properties take out data with which several methods work or external code

Answer 2

Some kind of porridge.

a specific method whose properties are not used in any other method

method properties?