WordPress at a glance
filter is not described

wp_dropdown_cats filter-hook . WP 2.1.0

Filters the taxonomy drop-down output.


add_filter( 'wp_dropdown_cats', 'filter_function_name_6767', 10, 2 );
function filter_function_name_6767( $output, $r ){
	// filter...

	return $output;
HTML output.
Arguments used to build the drop-down.

Where the hook is called

wp-includes/category-template.php 442
$output = apply_filters( 'wp_dropdown_cats', $output, $r );

Where the hook is used (in WP core)

Does not used.