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Fill it with concrete and you've got a poor mans bollard
And hammer at least one piece of rebar down through the bottom. Without the rebar, if you hit the post hard enough, the concrete will crack, and then you’ve got nothing more than the PVC pipe anyway. A piece of rebar down the center will greatly improve the strength of the whole thing. Having said that, if you’ve got a piece of steel pipe or conduit or something, you could save the price of the rebar, it just won’t last as long.
PVC will get brittle and fall apart when exposed to sunlight anyway.