php - Assign changed variable to the same variable is safe? -

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Is this a good practice and do I have any possibility of furrow if I entrusted the changing value of my own variable?

For example 

  $ myVar = 1; $ MyVar = $ myVar + 33 9 5 9 2; $ MyVar = rtrim ($ myVar, 2); $ MyVar = explosion (",", $ myVar);   
 I know this will work but what is safe to do this in PHP?   
 
 
 This violates the practice of  using good variable names  If the variable actually represents the same thing then I consider reassigning it. As it  does not  represent the same thing in this matter, I consider it a "bad" or "code odor".  
 (However, "work safely" otherwise)  
 Happy coding.

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