( resource result )
mysql_free_result() will free all memory
associated with the result identifier result.
mysql_free_result() only needs to be called if
you are concerned about how much memory is being used for queries
that return large result sets. All associated result memory is
automatically freed at the end of the script's execution.
Returns TRUE on success or FALSE on failure.
If a non-resource is used for the result, an
error of level E_WARNING will be emitted. It's worth noting that
mysql_query() only returns a resource
for SELECT, SHOW, EXPLAIN, and DESCRIBE queries.