Would it be fair to say learning Java would make me a better PHP OOP Developer?

Would it be fair to say learning Java would make me a better PHP OOP Developer? I've been looking into Java so I can understand OOP better. Should I continue learning Java to better understand OOP or would I be better off sticking with PHP OPP. I've just learnt about interfaces and abstract classes, will I really use these in PHP? Any advice will be useful as I want to get the most out of my time.