如果客户从未购买过，请将产品添加到购物车 - 代码不起作用

Question

我正在尝试实现一项功能，该功能将检查客户之前是否曾从我的商店购买过任何产品，如果没有 - 在首次购买时为他们提供免费的“注册礼物”。

我能够将产品自动添加到购物车中，但问题是在之后出现的 - 即使在客户购买后，产品也会继续添加到购物车中。

下面的代码 - 无法确定问题可能是什么。

function has_bought( $user_id = 0 ) {
    global $wpdb;
    $customer_id = $user_id == 0 ? get_current_user_id() : $user_id;
    $paid_order_statuses = array_map( 'esc_sql', wc_get_is_paid_statuses() );

    $results = $wpdb->get_col( "
        SELECT p.ID FROM {$wpdb->prefix}posts AS p
        INNER JOIN {$wpdb->prefix}postmeta AS pm ON p.ID = pm.post_id
        WHERE p.post_status IN ( 'wc-" . implode( "','wc-", $paid_order_statuses ) . "' )
        AND p.post_type LIKE 'shop_order'
        AND pm.meta_key = '_customer_user'
        AND pm.meta_value = $customer_id
    " );

    // Count number of orders and return a boolean value depending if higher than 0
    return count( $results ) > 0 ? true : false;
}

function aaptc_add_product_to_cart() {
    if( ! has_bought() && ! is_admin() && is_user_logged_in() ) {
        $product_id = 2449;  // Product Id of the free product which will get added to cart
        $found  = false;
        //check if product already in cart
        if ( sizeof( WC()->cart->get_cart() ) > 0 ) {
            foreach ( WC()->cart->get_cart() as $cart_item_key => $values ) {
                $_product = $values['data'];
                if ( $_product->get_id() == $product_id )
                    $found = true;
            }
            // if product not found, add it
            if ( ! $found )
                WC()->cart->add_to_cart( $product_id );
        } else {
            // if no products in cart, add it
            WC()->cart->add_to_cart( $product_id );
        }
    }    
}

add_action( 'init', 'aaptc_add_product_to_cart' );

**** 编辑 ****

根据提供的支持，我有一些新代码可以自动将产品添加到购物车，检查订单并在订单存在时删除产品。

有人可以确认下面的代码是否正确吗？

/*
* Automatically add product to cart
*/
function insta_add_product_to_cart() {
    if ( ! is_admin() ) {
        $product_id = 2449;  // Product Id of the free product which will get added to cart
        $found  = false;
        //check if product already in cart
        if ( sizeof( WC()->cart->get_cart() ) > 0 ) {
            foreach ( WC()->cart->get_cart() as $cart_item_key => $values ) {
                $_product = $values['data'];
                if ( $_product->get_id() == $product_id )
                    $found = true;
            }
            // if product not found, add it
            if ( ! $found )
                WC()->cart->add_to_cart( $product_id );
        } else {
            // if no products in cart, add it
            WC()->cart->add_to_cart( $product_id );
        }
    }    
}
add_action( 'init', 'insta_add_product_to_cart' );

function remove_shirt_returning_customer() {
    $product_id = 2449;  // Product Id of the free product which will get added to cart
    $user_id = get_current_user_id();
    // Get orders by customer.
    $args = array(
        'customer_id' => $user_id,
    );
    $orders = wc_get_orders( $args );

    if ( !empty($orders) ) {
        WC()->cart->remove_cart_item( $product_id );
    }
}
add_action( 'init', 'remove_shirt_returning_customer' );

**** 编辑 ***

解决方案

所以之前的代码仍然给了我错误。下面的代码似乎有效（在我的本地主机环境中）。

/*
* Automatically add product to cart
*/
function insta_add_product_to_cart() {
    if ( ! is_admin() ) {
        $product_id = 51;  // Product Id of the free product which will get added to cart
        $found  = false;
        //check if product already in cart
        if ( sizeof( WC()->cart->get_cart() ) > 0 ) {
            foreach ( WC()->cart->get_cart() as $cart_item_key => $values ) {
                $_product = $values['data'];
                if ( $_product->get_id() == $product_id )
                    $found = true;
            }
            // if product not found, add it
            if ( ! $found )
                WC()->cart->add_to_cart( $product_id );
        } else {
            // if no products in cart, add it
            WC()->cart->add_to_cart( $product_id );
        }
    }    
}
add_action( 'init', 'insta_add_product_to_cart' );

/*
* Remove item from cart if previous order exists
*/
function remove_shirt_returning_customer() {
        if ( ! is_admin() ) {
            $cart_items = WC()->cart->get_cart();
            $product_id = 51;  // Product Id of the free product which will get added to cart
            $user_id = get_current_user_id();
            // Get orders by customer.
            $args = array(
                'customer_id' => $user_id,
            );
            $orders = wc_get_orders( $args );
            foreach ( WC()->cart->get_cart() as $cart_item_key => $cart_item ) {
                 if ( $cart_item['product_id'] == $product_id && !empty( $orders ) ) {
                      WC()->cart->remove_cart_item( $cart_item_key );
             }
        }
    }
}
add_action( 'init', 'remove_shirt_returning_customer' );

Answer 1

您可以使用email address 或user id 检索客户的所有订单，而不是使用该自定义查询尝试使用wc_get_orders 函数

// Get orders by customer with ID 12.
$args = array(
    'customer_id' => 12,
);
$orders = wc_get_orders( $args );

更多关于wp_get_orders的信息可以在here找到

Answer 2

只有在用户登录帐户后，您才能知道他们之前是否曾向您订购过。因此，如果用户在您的网站上并已登录该帐户，您将必须找到which user，即：

$user_id = get_current_user_id();

从那里使用 Enrique 的回答来获取该客户是否已向您下订单。

$user_id = get_current_user_id();
$args = array(
    'customer_id' => 12,
);
$orders = wc_get_orders( $args );

从那里，测试$orders 是否为空，如果为空，则将该商品作为默认值保留在购物车中，如果没有，则将其删除。

更好的方法是自动将商品放入所有购物车，然后有条件地检查此用户是否已登录，并且之前已向您下过订单。如果是这样，请删除该项目。