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I have different widget areas. One is a horizontal area that may contain eg. 4 widgets next to each other. My Question is how would i add a different eg. $param['widget_title'] to widget number $n (via a filter)?

I already tried using wp_registered_widgets(); function and te different globals, but with no result.

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The dynamic_sidebar_params filter is called before each widget is displayed, I think you can use that to achieve what you want. It filters the $args and $instance parameters that will be passed to the widget. – Jan Fabry Apr 18 '11 at 15:21
@Jan Fabry - i already tried using the dynamic_sidebar_params filter with no result. Could you share an example? Thanks! – kaiser Apr 18 '11 at 15:42
@kaiser: Only if you show me your failed attempt first :-) A little code snippet would also explain what you are trying to do better. – Jan Fabry Apr 18 '11 at 15:43
@Jan Fabry - see updated Q. :) – kaiser Apr 18 '11 at 16:09
@Jan Fabry - see another Update :) – kaiser Apr 18 '11 at 16:29
up vote 1 down vote accepted

The dynamic_sidebar_params filter is called before each widget is displayed, so multiple times in the same sidebar. It filters the $args and $instance parameters that will be passed to the widget.

If you only want to execute it for the third widget of a specific sidebar, you should check for the sidebar ID (found in the id value of the $args array, which is passed first), and then count the widgets until you arrive at n. There are different ways to do this: you can get all widgets of the current sidebar and compare the ID of the n-th with the one you are filtering now, or you can just count it in your filter, resetting the count when you get a new sidebar name. Or you could replace dynamic_sidebar() in your template with a call to a function of your own that will first reset the widget count and then start filtering.

This is an example of the second type: counting widgets in the function, resetting the count each time we start a new sidebar:

add_filter( 'dynamic_sidebar_params', 'wpse15024_dynamic_sidebar_params' );
function wpse15024_dynamic_sidebar_params( $params )
    // These are the targets. Modify them here:
    $targeted_sidebar = 'sidebar-bottom';
    $targeted_widget = (int) 3;

    static $widget_counter = array();
    static $current_sidebar = null;

    $args = $params[0];
    $instance = $params[1];

    if ( $current_sidebar != $args['id'] ) {
        $current_sidebar = $args['id'];
        $widget_counter[$current_sidebar] = 0;

    if ( $current_sidebar == $targeted_sidebar && $widget_counter[$current_sidebar] == $targeted_widget ) {
        $args['before_widget'] = '<div id="'.@$args['widget_id'].'" class="span-6 last">';


    return array( $args, $instance );
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@Jan Fabry - i edited your answer slightly. I hope you don't mind (if so: sorry). – kaiser Apr 20 '11 at 12:15
@kaiser: Ah, the first time I saw a peer edit and could vote on it! Accepted! – Jan Fabry Apr 20 '11 at 12:53
@Jan Fabry - :) – kaiser Apr 20 '11 at 13:17
@Jan Fabry - another edit (but i'll stop now) :) – kaiser Apr 20 '11 at 13:26
@kaiser: If you make the before_widget part configurable you would also need to make the right hand side (the <div>) configurable. If we continue on that road we might hide the part of the function that really matters (to me): counting the sidebar widgets and doing something when we reach our widget. I think this example is clear enough now for anyone who wants to adopt it in their code. – Jan Fabry Apr 20 '11 at 13:51

This way everything works... but take a look at Jans approach.

That's the working code:

function wpse15024_modify_widget_params( $params )
    // These are the targets. Modify them here:
    $targeted_sidebar = 'sidebar-bottom';
    $targeted_widget = (int) 3;

    $sidebars_widgets = wp_get_sidebars_widgets();

    if ( $params[0]['id'] == $targeted_sidebar && $params[0]['widget_id'] == $sidebars_widgets[$targeted_sidebar][$targeted_widget] )
        $params[0]['before_widget'] = '<div id="'.@$params[0]['widget_id'].'" class="span-6 last">';

    return $params;
add_filter( 'dynamic_sidebar_params', 'wpse15024_modify_widget_params' );
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