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Can I just purchase my ticket for more than 30 days then get my tourist visa when I arrive in the Philippines?
I assume you know that you cannot "get a tourist visa" for Philippines when you are IN Philippines already; you can only extend your current stay. So I assume you are in essence asking "can I arrive to Philippines with a return ticket 2-3 months ahead, and manage to spend those 2-3 months in Philippines without leaving the country".
The answer is yes. The way it works is the following:
When you go to immigration, wear long pants, not shorts.