Add first and last css classes for sidebar widgets wordpress

add-first-and-last-css-classes-for-sidebar-widgets-wordpress

<?php
add_action('init', 'ak_add_order_classes_for_widgets' );

function ak_add_order_classes_for_widgets() {
    global $wp_registered_sidebars, $wp_registered_widgets;

    #Grab the widgets
    $sidebars = wp_get_sidebars_widgets();

    if ( empty( $sidebars ) ) {
        return;
    }

    #Loop through each widget and change the class names
    foreach ( $sidebars as $sidebar_id => $widgets ) {
        if ( empty( $widgets ) ) {
            continue;
        }

        $number_of_widgets = count( $widgets );
        
        foreach ( $widgets as $i => $widget_id ) {
            $wp_registered_widgets[$widget_id]['classname'] .= ' widget-order-' . $i;

            # Add first widget class
            if ( 0 == $i ) {
                $wp_registered_widgets[$widget_id]['classname'] .= ' ct-widget-first';
            }

            # Add last widget class
            if ( $number_of_widgets == ( $i + 1 ) ) {
                $wp_registered_widgets[$widget_id]['classname'] .= ' ct-widget-last';
            }
        }
    }
}