Question

当我添加$product->get_id()时，我得到了HTTP Error 500 并在错误日志中收到此消息：

[13-Mar-2018 08:47:07 UTC] PHP致命错误：调用成员函数 get_id（）on null in /home/healthnwellness/public_html/wp-content/themes/betheme-child/functions.php 在第926行

我的功能在functions.php：

//Function return price (commission based)  as per their purchase count 
function return_custom_price($price, $product) {
    global $product;
    $current_user = wp_get_current_user();

    $count_purchase = wc_product_sold_count();

    if ( wc_customer_bought_product( $current_user->user_email, $current_user->ID, $product->get_id() )  )
    {

        if($count_purchase == 1){
            $price = get_post_meta( $product->get_id(), '_comm_1_kit');
            $post_id =  $product->get_id();

            $price = ($price[0]);
            return $price;
        }
        elseif($count_purchase == 2){
            $price = get_post_meta( $product->get_id(), '_comm_2_kit');
            $post_id =  $product->get_id();

            $price = ($price[0]);
            return $price;
        }           
        elseif($count_purchase >= 3){
            $price = get_post_meta($product->get_id(), '_comm_3_kit');
            $post_id = $product->get_id();

            $price = ($price[0]);
            return $price;
        }
    }
    else
    {
        $price = get_post_meta($product->get_id(), '_discounted_price');
        $post_id = $product->get_id();

        $price = ($price[0]);
        return $price;
    }
}

如何解决此错误？我做错了什么？

感谢任何帮助。

注意：wc_product_sold_count()函数来from this answer，并且已更改为仅返回计数。

Answer 1

rtype

错误的任务。 $product->get_id() = $_SESSION["iddd"];返回一个int，并尝试使用其他值设置它。

它现在也出现在get_id()之前，因此它将为空。

Answer 2

您的代码中存在一些缺少的部分和许多错误。

您需要使用laso来稍微更改一下wc_product_sold_count() from this answer。

所以试试这个：

function wc_product_sold_count_for_user( $product, $user_id ) {
    global $wpdb;

    $product_id = $product->get_id(); // Current Product ID

    // The SQL request
    return $wpdb->get_var( "
        SELECT SUM(woim2.meta_value)
        FROM {$wpdb->prefix}woocommerce_order_items AS woi
        INNER JOIN {$wpdb->prefix}woocommerce_order_itemmeta woim ON woi.order_item_id = woim.order_item_id
        INNER JOIN {$wpdb->prefix}woocommerce_order_itemmeta woim2 ON woi.order_item_id = woim2.order_item_id
        INNER JOIN {$wpdb->prefix}postmeta pm ON woi.order_id = pm.post_id
        INNER JOIN {$wpdb->prefix}posts AS p ON woi.order_id = p.ID
        WHERE woi.order_item_type LIKE 'line_item'
        AND p.post_type LIKE 'shop_order'
        AND p.post_status IN ('wc-completed','wc-processing')
        AND pm.meta_key = '_customer_user'
        AND pm.meta_value = '$user_id'
        AND woim.meta_key = '_product_id'
        AND woim.meta_value = '$product_id'
        AND woim2.meta_key = '_qty'
    ");
}

//Function return price (commission based)  as per their purchase count
add_filter('woocommerce_product_get_price','return_custom_price', 10, 2);
function return_custom_price( $price, $product ) {
    // If user is not logged in return the default price
    if ( ! is_user_logged_in() ) return $price;

    $customer = wp_get_current_user();
    $count_purchase = wc_product_sold_count_for_user( $product, $customer->ID );

    if ( wc_customer_bought_product( $customer->user_email, $customer->ID, $product->get_id() ) ){

        if( $count_purchase == 1 )
            $price = get_post_meta( $product->get_id(), '_comm_1_kit', true );
        elseif( $count_purchase == 2 )
            $price = get_post_meta( $product->get_id(), '_comm_2_kit', true );
        elseif( $count_purchase >= 3 )
            $price = get_post_meta($product->get_id(), '_comm_3_kit', true );
    } else {
        $price = get_post_meta($product->get_id(), '_discounted_price', true );
    }
    return $price;
}

此代码位于您的活动子主题（或主题）的function.php文件中。经过测试和工作。

根据Woocommerce中与用户相关的购买动态更改产品价格

2 个答案: