Changes password for user with username. Parameters old_password and new_password should indicate old and new passwords respectively.
成功した場合に TRUE 、失敗した場合に FALSE を返します。
注意: 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.