我正在创建一个电子商务网站.我可以在主题的functions.php文件中添加什么,以使客户只能从商店购买一种产品,然后在1周内禁止其他任何购买？

客户可以购买任何产品,但是购买后一周内将无法再进行任何形式的购买.客户只能在一周后再进行其他购买.

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 );
}

解决方法:

Update from July 2018 – Enhanced lighter and more effective version code

>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的一周内进行了购买(嵌入在可重用的条件函数中).
>添加了购物车和结帐验证.

The following code will allow costumer to add only one item to cart and will allow only one purchase by week, displaying error notices when needed, avoiding any prohibited purchases.

编码：

// 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' );
    }
}

该代码进入您的活动子主题(或活动主题)的function.php文件中.经过测试和工作.