根据之前在WooCommerce上的订单，限制客户在同一周内多次购买特定产品

function my_ip_checker() {
    $last_order = get_posts(array(
        //'date_created'        => '>=' . (time() - 86400), time in seconds
    'meta_key'    => '_billing_email',
            'meta_value'  => sanitize_email( $_POST['cb_email'] ),
            'post_type'   => 'shop_order',
            'post_status' => array('wc-processing', 'wc-completed')
    ));
    if($last_order->total > 1) { 
        wc_add_notice('Too many orders in the last 24 hours. Please return later.', 'error');
    }
}
add_action('woocommerce_checkout_process', 'my_ip_checker', 10, 0);

function action_woocommerce_checkout_process() {
    // Initialize
    $customer_email = '';
    
    // Get email
    if ( is_user_logged_in() ) {
        // Get current user
        $user = wp_get_current_user();
        
        // Get email
        $customer_email = $user->user_email;
    } elseif ( isset( $_POST['billing_email'] ) && ! empty ( $_POST['billing_email'] ) ) {
        $customer_email = $_POST['billing_email'];  
    }
    
    // NOT empty
    if ( ! empty ( $customer_email ) ) {      
        // Time in seconds (1 week)
        $time_in_seconds = 604800;
        
        // Set limit per week
        $limit = 2;
        
        // Specific product id
        $specific_product_id = 30;
        
        // Get orders from last week from customer by email
        $orders_last_week_by_customer_email = wc_get_orders( array(
            'date_created'  => '>' . (time() - $time_in_seconds ),
            'customer'      => $customer_email,
        ));
        
        // Total (counter)
        $total = 0;
        
        // Iterating through each order
        foreach ( $orders_last_week_by_customer_email as $order ) {
            // Going through order items
            foreach ( $order->get_items() as $item ) {
                // Get product ID
                $product_id = $item->get_product_id();
                
                // Compare
                if ( $specific_product_id == $product_id ) {
                    // Get quantity
                    $quantity = $item->get_quantity();
                    
                    // Add to total
                    $total += $quantity;
                }
            }
        }

        // Show error when total >= limit
        if ( $total >= $limit ) {
            wc_add_notice( sprintf( __( 'You are not allowed to buy more than %d pieces of product with ID = %d in one week', 'woocommerce' ), $limit, $specific_product_id ), 'error' );
        }       
    }
}
add_action( 'woocommerce_checkout_process', 'action_woocommerce_checkout_process', 10, 0 );

// Get email
if ( is_user_logged_in() ) {
    // Get current user
    $user = wp_get_current_user();
    
    // Get email
    $customer_email = $user->user_email;
} elseif ( isset( $_POST['billing_email'] ) && ! empty ( $_POST['billing_email'] ) ) {
    $customer_email = $_POST['billing_email'];  
}

// Only for guests
if ( ! is_user_logged_in() ) return;

if ( isset( $_POST['billing_email'] ) && ! empty ( $_POST['billing_email'] ) ) {
    $customer_email = $_POST['billing_email'];  
}