msql_close() closes the link to a mSQL database that's associated with the specified link identifier. If the link identifier isn't specified, the last opened link is assumed.
Restituisce TRUE in caso di successo, FALSE in caso di fallimento.
Note that this isn't usually necessary, as non-persistent open links are automatically closed at the end of the script's execution.
msql_close() will not close persistent links generated by msql_pconnect().