When do I have to use mysql_free_result($res). Is it good to use it with
every query or only if the result is very big (what's the size of the result
I shoud use mysql_free_result?).
What's about the use of unset($var). Is this good to save RAM to make my
script run faster?
Do I have to do this also when I'm at the end of a function or is it
automatically done by leaving this function if it's not set global?

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