如果 cookie 存在，则读取并将其值设置为 Woocommerce 中的变量

Question

我在 Woocommerce 商店中创建了两个自定义函数。这个想法是将某种类型的产品限制为最多 3 个。我想设置一个 cookie 一周，以防止同一客户购买更多相同类型的产品。因此，如果客户今天购买了 1 个，那么在接下来的 6 天内，他们仍然可以再购买 2 个，直到 cookie 过期。但 3 永远是最大值。

该功能的工作原理是，如果在一个会话中将超过 3 个项目添加到购物篮中，它将设置一个限制，并且结帐后 cookie 仍然存在。我的预感是它没有在正确的时间被读取，或者被传递给检查它是否存在的函数。

    function filter_woocommerce_add_to_cart_validation( $true, $product_id, $request_quantity, $variation_id = '', $request_variation = '' ) {
        // holds checks for all products in cart to see if they're in our category
        $lpc_cookie = $_COOKIE['lpc'];

        if ( isset( $lpc_cookie ) ) {
            $category_checks = $lpc_cookie;
        } else {
            $category_checks = 0;
        }

        $limited_product_count = 4;
        $limited_slug = 'instant-print'; //replace 'instant-print' with your category's slug

        // check each cart item for our category
        if( ! is_admin() ) {
            foreach ( WC()->cart->get_cart() as $cart_item_key => $cart_item ) {
                $product = $cart_item['data'];

                if ( has_term( $limited_slug, 'product_cat', $product->id ) ) {
                    $category_checks += $cart_item['quantity'];
                }
            }
        }

        // We also check the item that the user is trying to add to cart
        if ( has_term( $limited_slug, 'product_cat', $product_id ) ) {
            $category_checks += $request_quantity;
        }

        if ($category_checks >= $limited_product_count) {
            $notice = 'Sorry, you have reached the maximum amount for this type of product that you can purchase during this period.';
            wc_add_notice( __( $notice, 'textdomain' ), 'error' );
            return false;
        }

        return $true;
    };

    add_filter( 'woocommerce_add_to_cart_validation', 'filter_woocommerce_add_to_cart_validation', 10, 3 );

    function set_cookie_for_limited_products () {
        $limited_slug = 'instant-print'; //replace 'instant-print' with your category's slug
        // check each cart item for our category
        if( ! is_admin() ) {
            foreach ( WC()->cart->get_cart() as $cart_item_key => $cart_item ) {
                $product = $cart_item['data'];

                if ( has_term( $limited_slug, 'product_cat', $product->id ) ) {
                    $category_checks += $cart_item['quantity'];
                }
            }
        }

        // $expire = time() + 60 * 60 * 24 * 7; // expires in one week
        $expire = time() + 60 * 60; // expires in one hour
        setcookie('lpc', $category_checks, $expire);
    }

    add_filter( 'woocommerce_before_checkout_form', 'set_cookie_for_limited_products' );

我希望这是显而易见的。最初我试图 echo 和 var_dump 变量，但我发现这会导致其他东西中断。

Answer 1

这很简单，我可以举个例子，但是如果客人可以购买，你将无法保存该信息，这是一个考虑了两种可能情况的例子。

function filter_woocommerce_add_to_cart_validation( $true, $product_id, $request_quantity, $variation_id = '', $request_variation = '' ) {
        // holds checks for all products in cart to see if they're in our category

        $limited_product_count = 4;
        $limited_slug = 'instant-print'; //replace 'instant-print' with your category's slug

        if(is_user_logged_in()) {
            //Using database
            $user_id = get_current_user_id();
            $lpc_cookie = get_user_meta( $user_id, $limited_slug, true );
            $expire = get_user_meta( $user_id, $limited_slug . '_expire', true );
        }else{
            //Using cookie
            $lpc_cookie = $_COOKIE['lpc'];
        }

        //Check lpc_cookie and expire value
        if ( isset( $lpc_cookie ) && $expire > time() ) {
            $category_checks = $lpc_cookie;
        } else {
            $category_checks = 0;
        }

        

        // check each cart item for our category
        if( ! is_admin() ) {
            foreach ( WC()->cart->get_cart() as $cart_item_key => $cart_item ) {
                $product = $cart_item['data'];

                if ( has_term( $limited_slug, 'product_cat', $product->id ) ) {
                    $category_checks += $cart_item['quantity'];
                }
            }
        }

        // We also check the item that the user is trying to add to cart
        if ( has_term( $limited_slug, 'product_cat', $product_id ) ) {
            $category_checks += $request_quantity;
        }

        if ($category_checks >= $limited_product_count) {
            $notice = 'Sorry, you have reached the maximum amount for this type of product that you can purchase during this period.';
            wc_add_notice( __( $notice, 'textdomain' ), 'error' );
            return false;
        }

        return $true;
    };

    add_filter( 'woocommerce_add_to_cart_validation', 'filter_woocommerce_add_to_cart_validation', 10, 3 );

    function set_cookie_for_limited_products () {
        $limited_slug = 'instant-print'; //replace 'instant-print' with your category's slug
        // check each cart item for our category
        if( ! is_admin() ) {
            foreach ( WC()->cart->get_cart() as $cart_item_key => $cart_item ) {
                $product = $cart_item['data'];

                if ( has_term( $limited_slug, 'product_cat', $product->id ) ) {
                    $category_checks += $cart_item['quantity'];
                }
            }
        }

        // $expire = time() + 60 * 60 * 24 * 7; // expires in one week
        $expire = time() + 60 * 60; // expires in one hour

        if(is_user_logged_in()) {
            //Using database
            $user_id = get_current_user_id();
            update_user_meta( $user_id, $limited_slug, $category_checks );
            update_user_meta( $user_id, $limited_slug . '_expire', $expire );
        }else{
            //Using cookie
            setcookie('lpc', $category_checks, $expire);
        }
    }

    add_filter( 'woocommerce_before_checkout_form', 'set_cookie_for_limited_products' );