mssql_free_result() only needs to be called
if you are worried about using too much memory while your script
is running. All result memory will automatically be freed when
the script ends. You may call mssql_free_result()
with the result identifier as an argument and the associated
result memory will be freed.
Parameters
result
The result resource that is being freed. This result comes from a
call to mssql_query().