When PHP completes a request, this memory is freed automatically, so you only need to call this function when you want to make sure you don 't use too much memory while the script is running.
msql_free_result() frees the memory associated with query_identifier. When PHP completes a request, this memory is freed automatically, so you only need to call this function when you want to make sure you don't use too much memory while the script is running.