Changes password for user with username. Parameters old_password and new_password should indicate old and new passwords respectively.
Restituisce TRUE in caso di successo, FALSE in caso di fallimento.
Nota: In PHP versions before 5.0.0 you must use ocipasswordchange() instead. This name still can be used, it was left as alias of oci_password_change() for downwards compatability. This, however, is deprecated and not recommended.