Drops the $ _SESSION variable into a bad idea before setting session var?

On the page I'm developing, I store data through $ _session, but since I dynamically invoke pages using jquery, I would like to add some security and unset ($ _ SESSION ['var']) before I set them just in case something happens. My question is if you disconnect a session with a bad idea before setting it up or is it completely?

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This is unnecessary and will have no effect.

Ajax-, , , - , , !

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