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@4 e editine karşın:
Both are grammatically correct because in modern English, the only thing needed to express a counterfactual situation is a past tense verb.
If I was you = I'm not you,
just as,
If I were you = I'm not you.
It works the same way with 'wish'.
The correct form is,
- I wish I were there.
You use this form to show an "unreal" situation, i.e. the thing you are wishing for is not the way things really are.
You may sometimes hear "was" used, since the subjunctive is relatively uncommon in English and people sometimes forget to use it, but "were" is definitely the correct verb.
