adding first and last classes to widgets

inc/roots-cleanup.php

@@ -465,4 +465,40 @@ function roots_body_class() {
 		return;
 }
 
+// first and last classes for widgets
+// http://wordpress.org/support/topic/how-to-first-and-last-css-classes-for-sidebar-widgets
+function roots_widget_first_last_classes($params) {
+	global $my_widget_num;
+	$this_id = $params[0]['id'];
+	$arr_registered_widgets = wp_get_sidebars_widgets();	
+
+	if (!$my_widget_num) {
+		$my_widget_num = array();
+	}
+
+	if (!isset($arr_registered_widgets[$this_id]) || !is_array($arr_registered_widgets[$this_id])) {
+		return $params;
+	}
+
+	if (isset($my_widget_num[$this_id])) {
+		$my_widget_num[$this_id] ++;
+	} else {
+		$my_widget_num[$this_id] = 1;
+	}
+
+	$class = 'class="widget-' . $my_widget_num[$this_id] . ' ';
+
+	if ($my_widget_num[$this_id] == 1) {
+		$class .= 'widget-first ';
+	} elseif ($my_widget_num[$this_id] == count($arr_registered_widgets[$this_id])) {
+		$class .= 'widget-last ';
+	}
+
+	$params[0]['before_widget'] = str_replace('class="', $class, $params[0]['before_widget']);
+
+	return $params;
+
+}
+add_filter('dynamic_sidebar_params', 'roots_widget_first_last_classes');
+
 ?>