每周允许在Woocommerce购买一次

Question

我正在创建一个电子商务网站。我可以向模板的函数.php文件添加什么，以允许客户仅从商店购买一种产品，然后在 1 周内禁用任何其他购买？

客户可以购买任何产品，但在购买后，一周内不能再购买任何形式的产品。客户只能在一周后进行任何其他购买。

我只能使用以下代码禁用对产品的购买：

add_filter( 'woocommerce_add_cart_item_data', 'woo_allow_one_item_only' );
function woo_allow_one_item_only( $cart_item_data ) {
global $woocommerce;
$woocommerce->cart->empty_cart();
// Do nothing with the data and return
return $cart_item_data;
} 
$customer_orders = get_posts( array(
'numberposts' => -1,
'meta_key'    => '_customer_user',
'meta_value'  => get_current_user_id(),
'post_type'   => wc_get_order_types(),
'post_status' => array( 'wc-pending', 'wc-processing', 'wc-on-hold', 'wc-completed' ),
) );
// Order count
$order_count = 1;
if ( count( $customer_orders ) >= $order_count ) {
add_filter( 'woocommerce_is_purchasable', false );
}

Answer 1

2018 年 7 月更新 - 增强了更轻量级、更有效的版本代码

• 简化产品添加到购物车验证
• 更好、更轻松的方式来检查用户是否在过去一周内购买了(嵌入在可重用的条件函数中(。
• 添加了购物车和结帐验证。

以下代码将允许客户仅将一件商品添加到购物车，并且每周只允许购买一次，在需要时显示错误通知，避免任何禁止购买。

代码：

// Utility conditional function (Check if user has purchased in the passed week)
function has_week_purshases( $user_id = 0 ){
    global $wpdb;
    $customer_id = $user_id > 0 ? $user_id : get_current_user_id();
    $count = $wpdb->get_var( "
        SELECT COUNT(p.ID)
        FROM {$wpdb->prefix}posts as p
        INNER JOIN {$wpdb->prefix}postmeta as pm ON p.ID = pm.post_id
        WHERE p.post_type LIKE 'shop_order'
        AND pm.meta_key LIKE '_customer_user'
        AND pm.meta_value = $customer_id
        AND UNIX_TIMESTAMP(p.post_date) >= (UNIX_TIMESTAMP(NOW()) - (86400 * 7))
    " );
    return $count > 0 ? true : false;
}
// product add to cart validation
add_filter( 'woocommerce_add_to_cart_validation', 'conditionally_allowing_product_added_to_cart', 10, 3 );
function conditionally_allowing_product_added_to_cart( $passed, $product_id, $quantity) {
    // If cart is not empty, customer will not be allowed and a notice will be displayed
    if ( ! WC()->cart->is_empty() ){
        // Display an error notice if there is already an item in cart
        wc_add_notice( __("You can only add an item to cart"), 'error' );
        $passed = false; // Not Allowed
    } elseif ( is_user_logged_in() && has_week_purshases() ) {
        // Display an error notice when customer is not allowed yet
        wc_add_notice( __("You are not allowed yet to add any product in cart"), 'error' );
        $passed = false; // Not Allowed
    }
    return $passed;
}
// Cart and checkout validation
add_action( 'woocommerce_check_cart_items', 'conditionally_allowing_checkout' );
add_action( 'woocommerce_checkout_process', 'conditionally_allowing_checkout' );
function conditionally_allowing_checkout() {
    if ( sizeof(WC()->cart->get_cart()) > 1 ) {
        // Display an error notice if there is more than 1 item in cart
        wc_add_notice( _("You can only have only one item in cart"), 'error' );
    } elseif ( is_user_logged_in() && has_week_purshases() ) {
        // Display an error notice when customer is not allowed yet
        wc_add_notice( __("You are not allowed yet to make purchases"), 'error' );
    }
}

代码进入函数.php活动子主题(或活动主题(的文件。经过测试并工作。