How can I add an incremental class identifier to my sidebar widgets?

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There doesn’t seem to be an easy way to do this. However, you can try this rather hackish approach:

add_filter('dynamic_sidebar_params', 'my_sidebar_params_cb');

function my_sidebar_params_cb($params) {
    global $my_widget_counter;
    if (empty($my_widget_counter)) $my_widget_counter = 1;
    else $my_widget_counter++;
    $params[0]['before_widget'] = str_replace('class="', 'class="widget_nr_'.$my_widget_counter.' ', $params[0]['before_widget']);
    return $params;
}

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