E' esatto come anche riportato in http://it2.php.net/manual/en/functio...ree-result.php

"When you call a query, you are returned a handle, which points to a set of results and the associated variables for it. When you call free_result with that handle it will do a garbage - collection upon the result and associated variables, freeing up the memory."

Ed anche in http://it2.php.net/manual/en/feature...onnections.php

"Freeing resources
Due to the reference-counting system introduced with PHP 4's Zend Engine, it is automatically detected when a resource is no longer referred to (just like Java). When this is the case, all resources that were in use for this resource are made free by the garbage collector. For this reason, it is rarely ever necessary to free the memory manually by using some free_result function"