Recently viewed product tracking on woocommerce with a shortcode and cookies

woocommerce_recently_viewed_products.php

/**
 * https://github.com/woocommerce/woocommerce/issues/9724#issuecomment-160618200
 */
function custom_track_product_view() {
    if ( ! is_singular( 'product' ) ) {
        return;
    }

    global $post;

    if ( empty( $_COOKIE['woocommerce_recently_viewed'] ) )
        $viewed_products = array();
    else
        $viewed_products = (array) explode( '|', $_COOKIE['woocommerce_recently_viewed'] );

    if ( ! in_array( $post->ID, $viewed_products ) ) {
        $viewed_products[] = $post->ID;
    }

    if ( sizeof( $viewed_products ) > 15 ) {
        array_shift( $viewed_products );
    }

    // Store for session only
    wc_setcookie( 'woocommerce_recently_viewed', implode( '|', $viewed_products ) );
}

add_action( 'template_redirect', 'custom_track_product_view', 20 );



/**
 * Register the [woocommerce_recently_viewed_products per_page="5"] shortcode
 *
 * This shortcode displays recently viewed products using WooCommerce default cookie
 * It only has one parameter "per_page" to choose number of items to show
 *
 * Source: http://snippets.drumcreative.com/?p=91
*/
function rc_woocommerce_recently_viewed_products( $atts, $content = null ) {
    // Get shortcode parameters
    extract(shortcode_atts(array(
        "per_page" => '5'
    ), $atts));
    // Get WooCommerce Global
    global $woocommerce;
    // Get recently viewed product cookies data
    $viewed_products = ! empty( $_COOKIE['woocommerce_recently_viewed'] ) ? (array) explode( '|', $_COOKIE['woocommerce_recently_viewed'] ) : array();
    $viewed_products = array_filter( array_map( 'absint', $viewed_products ) );
    // If no data, quit
    if ( empty( $viewed_products ) )
        return __( 'You have not viewed any product yet!', 'rc_wc_rvp' );
    // Create the object
    ob_start();
    // Get products per page
    if( !isset( $per_page ) ? $number = 5 : $number = $per_page )
    // Create query arguments array
    $query_args = array(
                    'posts_per_page' => $number,
                    'no_found_rows'  => 1,
                    'post_status'    => 'publish',
                    'post_type'      => 'product',
                    'post__in'       => $viewed_products,
                    'orderby'        => 'rand'
                    );
    // Add meta_query to query args
    $query_args['meta_query'] = array();
    // Check products stock status
    $query_args['meta_query'][] = $woocommerce->query->stock_status_meta_query();
    // Create a new query
    $r = new WP_Query($query_args);

    // ----

    if (empty($r)) {
      return __( 'You have not viewed any product yet!', 'rc_wc_rvp' );
    }

    ?>

      <?php woocommerce_product_loop_start(); ?>
          <?php while ( $r->have_posts() ) : $r->the_post(); ?>
              <?php woocommerce_get_template_part( 'content', 'product' ); ?>
          <?php endwhile; ?>
      <?php woocommerce_product_loop_end(); ?>

    <?php wp_reset_postdata();
    return '<div class="woocommerce columns-5 facetwp-template">' . ob_get_clean() . '</div>';

    // ----

    // Get clean object
    $content .= ob_get_clean();
    // Return whole content
    return $content;
}

// Register the shortcode
add_shortcode("woocommerce_recently_viewed_products", "rc_woocommerce_recently_viewed_products");