Woocommerce_recently_viewed

/**
 * Track product views. Always.
 */
function wc_track_product_view_always() {
    if ( ! is_singular( 'product' ) /* xnagyg: remove this condition to run: || ! is_active_widget( false, false, 'woocommerce_recently_viewed_products', true )*/ ) {
        return;
    }

    global $post;

    if ( empty( $_COOKIE['woocommerce_recently_viewed'] ) ) { // @codingStandardsIgnoreLine.
        $viewed_products = array();
    } else {
        $viewed_products = wp_parse_id_list( (array) explode( '|', wp_unslash( $_COOKIE['woocommerce_recently_viewed'] ) ) ); // @codingStandardsIgnoreLine.
    }

    // Unset if already in viewed products list.
    $keys = array_flip( $viewed_products );

    if ( isset( $keys[ $post->ID ] ) ) {
        unset( $viewed_products[ $keys[ $post->ID ] ] );
    }

    $viewed_products[] = $post->ID;

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

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

remove_action('template_redirect', 'wc_track_product_view', 20);
add_action( 'template_redirect', 'wc_track_product_view_always', 20 );

Source: stackoverflow.com

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