WooCommerce Auto-Cart Clear

<?php

if ( ! class_exists( 'WC_Session' ) ) {
    return;
}

class WC_Clear_Cart_After_Time {

    protected $cart_cleared;

    public function __construct() {
        $this->cart_cleared = false;
        add_action( 'init', array( $this, 'clear_cart_after_time' ) );
    }

    public function clear_cart_after_time() {
        if ( ! $this->cart_cleared && is_user_logged_in() ) {
            $last_activity = get_user_meta( get_current_user_id(), '_wc_last_activity', true );
            $now = time();

            if ( ! empty( $last_activity ) && $now - $last_activity >= 300 ) {
                WC()->cart->empty_cart();
                $this->cart_cleared = true;
            }

            update_user_meta( get_current_user_id(), '_wc_last_activity', $now );
        } elseif ( ! $this->cart_cleared && ! is_user_logged_in() ) {
            if ( isset( $_COOKIE['woocommerce_cart_last_activity'] ) ) {
                $last_activity = $_COOKIE['woocommerce_cart_last_activity'];
                $now = time();

                if ( $now - $last_activity >= 300 ) {
                    WC()->cart->empty_cart();
                    $this->cart_cleared = true;
                }
            }

            setcookie( 'woocommerce_cart_last_activity', time(), time() + 3600 * 24 );
        }
    }
}

new WC_Clear_Cart_After_Time();
?>