Changes password for user with username. Parameters old_password and new_password should indicate old and new passwords respectively.
성공일 경우 TRUE를, 실패일 경우 FALSE를 반환합니다.
참고: 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.