When you unset() a mysql result, does it free the memory like mysql_free_result() does?
When you unset() a mysql result, does it free the memory like mysql_free_result() does?
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When you unset() a mysql result, does it free the memory like mysql_free_result() does?
No.
unset()clears the pointer to the result on php’s side, but does not do anything to the result it points to. The result of amysql_query()is simply a numerical identifier so that MySQL knows which result you’re referring for functions likemysql_fetch_array()and its companions. You need to usemysql_free_result()to tell MySQL that you’re done with that result; you can also unset the php variable afterwards as well, but as it’s just a resource, the time it takes to unset may not be worth the few bytes you save from unsetting it.