diff --git a/includes/widgets/class-wc-widget-layered-nav.php b/includes/widgets/class-wc-widget-layered-nav.php
index 5ffcb3099a6..7ae70486aee 100644
--- a/includes/widgets/class-wc-widget-layered-nav.php
+++ b/includes/widgets/class-wc-widget-layered-nav.php
@@ -3,20 +3,13 @@
  * Layered nav widget
  *
  * @package WooCommerce/Widgets
+ * @version  2.6.0
  */
 
-if ( ! defined( 'ABSPATH' ) ) {
-	exit;
-}
+defined( 'ABSPATH' ) || exit;
 
 /**
- * Layered Navigation Widget.
- *
- * @author   WooThemes
- * @category Widgets
- * @package  WooCommerce/Widgets
- * @version  2.6.0
- * @extends  WC_Widget
+ * Widget layered nav class.
  */
 class WC_Widget_Layered_Nav extends WC_Widget {
 
@@ -74,12 +67,12 @@ class WC_Widget_Layered_Nav extends WC_Widget {
 		}
 
 		$this->settings = array(
-			'title' => array(
+			'title'        => array(
 				'type'  => 'text',
 				'std'   => __( 'Filter by', 'woocommerce' ),
 				'label' => __( 'Title', 'woocommerce' ),
 			),
-			'attribute' => array(
+			'attribute'    => array(
 				'type'    => 'select',
 				'std'     => '',
 				'label'   => __( 'Attribute', 'woocommerce' ),
@@ -94,7 +87,7 @@ class WC_Widget_Layered_Nav extends WC_Widget {
 					'dropdown' => __( 'Dropdown', 'woocommerce' ),
 				),
 			),
-			'query_type' => array(
+			'query_type'   => array(
 				'type'    => 'select',
 				'std'     => 'and',
 				'label'   => __( 'Query type', 'woocommerce' ),
@@ -133,18 +126,18 @@ class WC_Widget_Layered_Nav extends WC_Widget {
 		$orderby = wc_attribute_orderby( $taxonomy );
 
 		switch ( $orderby ) {
-			case 'name' :
+			case 'name':
 				$get_terms_args['orderby']    = 'name';
 				$get_terms_args['menu_order'] = false;
-			break;
-			case 'id' :
+				break;
+			case 'id':
 				$get_terms_args['orderby']    = 'id';
 				$get_terms_args['order']      = 'ASC';
 				$get_terms_args['menu_order'] = false;
-			break;
-			case 'menu_order' :
+				break;
+			case 'menu_order':
 				$get_terms_args['menu_order'] = 'ASC';
-			break;
+				break;
 		}
 
 		$terms = get_terms( $taxonomy, $get_terms_args );
@@ -154,12 +147,12 @@ class WC_Widget_Layered_Nav extends WC_Widget {
 		}
 
 		switch ( $orderby ) {
-			case 'name_num' :
+			case 'name_num':
 				usort( $terms, '_wc_get_product_terms_name_num_usort_callback' );
-			break;
-			case 'parent' :
+				break;
+			case 'parent':
 				usort( $terms, '_wc_get_product_terms_parent_usort_callback' );
-			break;
+				break;
 		}
 
 		ob_start();
@@ -232,9 +225,11 @@ class WC_Widget_Layered_Nav extends WC_Widget {
 			$_chosen_attributes   = WC_Query::get_layered_nav_chosen_attributes();
 			$taxonomy_filter_name = str_replace( 'pa_', '', $taxonomy );
 			$taxonomy_label       = wc_attribute_label( $taxonomy );
-			$any_label            = apply_filters( 'woocommerce_layered_nav_any_label', sprintf( __( 'Any %s', 'woocommerce' ), $taxonomy_label ), $taxonomy_label, $taxonomy );
-			$multiple             = 'or' === $query_type;
-			$current_values       = isset( $_chosen_attributes[ $taxonomy ]['terms'] ) ? $_chosen_attributes[ $taxonomy ]['terms'] : array();
+
+			/* translators: %s: taxonomy name */
+			$any_label      = apply_filters( 'woocommerce_layered_nav_any_label', sprintf( __( 'Any %s', 'woocommerce' ), $taxonomy_label ), $taxonomy_label, $taxonomy );
+			$multiple       = 'or' === $query_type;
+			$current_values = isset( $_chosen_attributes[ $taxonomy ]['terms'] ) ? $_chosen_attributes[ $taxonomy ]['terms'] : array();
 
 			if ( '' === get_option( 'permalink_structure' ) ) {
 				$form_action = remove_query_arg( array( 'page', 'paged' ), add_query_arg( $wp->query_string, '', home_url( $wp->request ) ) );
@@ -254,8 +249,8 @@ class WC_Widget_Layered_Nav extends WC_Widget {
 				}
 
 				// Get count based on current view.
-				$option_is_set  = in_array( $term->slug, $current_values );
-				$count          = isset( $term_counts[ $term->term_id ] ) ? $term_counts[ $term->term_id ] : 0;
+				$option_is_set = in_array( $term->slug, $current_values, true );
+				$count         = isset( $term_counts[ $term->term_id ] ) ? $term_counts[ $term->term_id ] : 0;
 
 				// Only show options with count > 0.
 				if ( 0 < $count ) {
@@ -281,7 +276,8 @@ class WC_Widget_Layered_Nav extends WC_Widget {
 			echo wc_query_string_form_fields( null, array( 'filter_' . $taxonomy_filter_name, 'query_type_' . $taxonomy_filter_name ), '', true ); // @codingStandardsIgnoreLine
 			echo '</form>';
 
-			wc_enqueue_js( "
+			wc_enqueue_js(
+				"
 				// Update value on change.
 				jQuery( '.dropdown_layered_nav_" . esc_js( $taxonomy_filter_name ) . "' ).change( function() {
 					var slug = jQuery( this ).val();
@@ -310,7 +306,8 @@ class WC_Widget_Layered_Nav extends WC_Widget {
 					};
 					wc_layered_nav_select();
 				}
-			" );
+			"
+			);
 		}
 
 		return $found;
@@ -340,10 +337,10 @@ class WC_Widget_Layered_Nav extends WC_Widget {
 			}
 		}
 
-		$meta_query      = new WP_Meta_Query( $meta_query );
-		$tax_query       = new WP_Tax_Query( $tax_query );
-		$meta_query_sql  = $meta_query->get_sql( 'post', $wpdb->posts, 'ID' );
-		$tax_query_sql   = $tax_query->get_sql( $wpdb->posts, 'ID' );
+		$meta_query     = new WP_Meta_Query( $meta_query );
+		$tax_query      = new WP_Tax_Query( $tax_query );
+		$meta_query_sql = $meta_query->get_sql( 'post', $wpdb->posts, 'ID' );
+		$tax_query_sql  = $tax_query->get_sql( $wpdb->posts, 'ID' );
 
 		// Generate query.
 		$query           = array();
@@ -355,13 +352,14 @@ class WC_Widget_Layered_Nav extends WC_Widget {
 			INNER JOIN {$wpdb->terms} AS terms USING( term_id )
 			" . $tax_query_sql['join'] . $meta_query_sql['join'];
 
-		$query['where']   = "
+		$query['where'] = "
 			WHERE {$wpdb->posts}.post_type IN ( 'product' )
 			AND {$wpdb->posts}.post_status = 'publish'"
 			. $tax_query_sql['where'] . $meta_query_sql['where'] .
 			'AND terms.term_id IN (' . implode( ',', array_map( 'absint', $term_ids ) ) . ')';
 
-		if ( $search = WC_Query::get_main_search_query_sql() ) {
+		$search = WC_Query::get_main_search_query_sql();
+		if ( $search ) {
 			$query['where'] .= ' AND ' . $search;
 		}
 
@@ -401,7 +399,7 @@ class WC_Widget_Layered_Nav extends WC_Widget {
 
 		foreach ( $terms as $term ) {
 			$current_values = isset( $_chosen_attributes[ $taxonomy ]['terms'] ) ? $_chosen_attributes[ $taxonomy ]['terms'] : array();
-			$option_is_set  = in_array( $term->slug, $current_values );
+			$option_is_set  = in_array( $term->slug, $current_values, true );
 			$count          = isset( $term_counts[ $term->term_id ] ) ? $term_counts[ $term->term_id ] : 0;
 
 			// Skip the term for the current archive.
@@ -417,10 +415,10 @@ class WC_Widget_Layered_Nav extends WC_Widget {
 			}
 
 			$filter_name    = 'filter_' . sanitize_title( str_replace( 'pa_', '', $taxonomy ) );
-			$current_filter = isset( $_GET[ $filter_name ] ) ? explode( ',', wc_clean( wp_unslash( $_GET[ $filter_name ] ) ) ) : array();
+			$current_filter = isset( $_GET[ $filter_name ] ) ? explode( ',', wc_clean( wp_unslash( $_GET[ $filter_name ] ) ) ) : array(); // WPCS: input var ok, CSRF ok.
 			$current_filter = array_map( 'sanitize_title', $current_filter );
 
-			if ( ! in_array( $term->slug, $current_filter ) ) {
+			if ( ! in_array( $term->slug, $current_filter, true ) ) {
 				$current_filter[] = $term->slug;
 			}