woocommerce/includes/widgets/class-wc-widget-recently-viewed.php

<?php

if ( ! defined( 'ABSPATH' ) ) {
	exit;
}

/**
 * Recent Products Widget.
 *
 * @author   WooThemes
 * @category Widgets
 * @package  WooCommerce/Widgets
 * @version  2.3.0
 * @extends  WC_Widget
 */
class WC_Widget_Recently_Viewed extends WC_Widget {

	/**
	 * Constructor.
	 */
	public function __construct() {
		$this->widget_cssclass    = 'woocommerce widget_recently_viewed_products';
		$this->widget_description = __( 'Display a list of recently viewed products.', 'woocommerce' );
		$this->widget_id          = 'woocommerce_recently_viewed_products';
		$this->widget_name        = __( 'WooCommerce recently viewed', 'woocommerce' );
		$this->settings           = array(
			'title'  => array(
				'type'  => 'text',
				'std'   => __( 'Recently viewed products', 'woocommerce' ),
				'label' => __( 'Title', 'woocommerce' ),
			),
			'number' => array(
				'type'  => 'number',
				'step'  => 1,
				'min'   => 1,
				'max'   => '',
				'std'   => 10,
				'label' => __( 'Number of products to show', 'woocommerce' ),
			),
		);

		parent::__construct();
	}

	/**
	 * Output widget.
	 *
	 * @see WP_Widget
	 *
	 * @param array $args
	 * @param array $instance
	 */
	public function widget( $args, $instance ) {

		$viewed_products = ! empty( $_COOKIE['woocommerce_recently_viewed'] ) ? (array) explode( '|', $_COOKIE['woocommerce_recently_viewed'] ) : array();
		$viewed_products = array_reverse( array_filter( array_map( 'absint', $viewed_products ) ) );

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

		ob_start();

		$number = ! empty( $instance['number'] ) ? absint( $instance['number'] ) : $this->settings['number']['std'];

		$query_args = array( 'posts_per_page' => $number, 'no_found_rows' => 1, 'post_status' => 'publish', 'post_type' => 'product', 'post__in' => $viewed_products, 'orderby' => 'post__in' );

		$query_args['meta_query']   = array();
		$query_args['meta_query'][] = WC()->query->stock_status_meta_query();
		$query_args['meta_query']   = array_filter( $query_args['meta_query'] );

		$r = new WP_Query( $query_args );

		if ( $r->have_posts() ) {

			$this->widget_start( $args, $instance );

			echo apply_filters( 'woocommerce_before_widget_product_list', '<ul class="product_list_widget">' );

			while ( $r->have_posts() ) {
				$r->the_post();
				wc_get_template( 'content-widget-product.php' );
			}

			echo apply_filters( 'woocommerce_after_widget_product_list', '</ul>' );

			$this->widget_end( $args );
		}

		wp_reset_postdata();

		$content = ob_get_clean();

		echo $content;
	}
}