How to determine which sidebar the widget has been added to, via widget admin?

    $sideBars = wp_get_sidebars_widgets ();
    $mySideBar = false;
    foreach ($sideBars as $sideBarName => $sideBar) {
      if (array_search ($this->id, $sideBar) !== false) {
        $mySideBar = $sideBarName;
        break;
      }
    }

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