// This alters the get get_terms() arguments and hides some categories
function widget_category_excluder( $args ) {
    // Replace the numbers with category IDs you need hidden
    $args[\'exclude\'] = $args[\'exclude\'].\',1,2,3,\'; // Keep it safe!
    // Or use exclude_tree to exclude children categories also
    // $args[\'exclude\'] = $args[\'exclude\'].\',1,2,3,\'; // Keep it safe!
    // (,1,2,3, is enclosed in \',\' to ensure digits don\'t get welded)
    // Test and see what fits your needs best
    return $args;
}
// This allows hooking into WP_Widget_Categories and excluding Terms
add_filter( \'widget_categories_dropdown_args\', \'widget_category_excluder\' );
add_filter( \'widget_categories_args\', \'widget_category_excluder\' );

当做