我需要向Fatal error: Uncaught Error: Call to a member function get_billing_email() on null in
我已经尝试了来自stackoverflow的一些功能（如下所示），结果相同：
function wc_cancelled_order_add_customer_email( $recipient, $order )
{
return $recipient .= "," . $order->get_billing_email();
}
add_filter( 'woocommerce_email_recipient_cancelled_order', 'wc_cancelled_order_add_customer_email', 10, 2 );
add_filter( 'woocommerce_email_recipient_failed_order', 'wc_cancelled_order_add_customer_email', 10, 2 );
怎么了？如何避免此错误？
答案 0 :(得分：2)
您需要检查$order参数是否是WC_Order类的有效实例：
add_filter( 'woocommerce_email_recipient_cancelled_order', 'wc_cancelled_order_add_customer_email', 10, 2 );
add_filter( 'woocommerce_email_recipient_failed_order', 'wc_cancelled_order_add_customer_email', 10, 2 );
function wc_cancelled_order_add_customer_email( $recipient, $order ){
// Avoiding errors in backend (mandatory when using $order argument)
if ( ! is_a( $order, 'WC_Order' ) ) return $recipient;
return $recipient .= "," . $order->get_billing_email();
}
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，可以正常工作。
在这种特殊情况下，您也可以使用
// Avoiding errors in backend (mandatory when using $order argument) if ( ! method_exists( $order, 'get_billing_email' ) ) return $recipient;
相关和相似的内容：
答案 1 :(得分：1)
我找到了一个非常好的方法：
首先，通过向 woocommerce_email_classes 添加过滤器来扩展 woocommerce 默认电子邮件：
add_filter('woocommerce_email_classes', function ($classes) {
$classes['WC_Email_Customer_Order_Failed'] = include __DIR__ . "/wc-emails/class-wc-customer-order-failed.php";
// you can add as many classes as you want here
return $classes;
});
然后，我们创建 ./wc-emails/class-wc-customer-order-failed.php 文件。我建议从位于 /wp-content/plugins/woocommerce/emails/class-wc-email-{$email-name}.php 下的原始 WC_Email 类之一开始。确保在完成后重命名类。在撰写本文时，我使用的是 Woocommerce 5.3.0，并且 class-wc-customer-order-failed.php 应如下所示：
<?php
if (!defined('ABSPATH')) {
exit; // Exit if accessed directly.
}
if (!class_exists('WC_Email_Customer_Order_Failed', false)) {
/**
* Cancelled Order Email.
*
* An email sent to the admin when an order is cancelled.
*
* @class WC_Email_Cancelled_Order
* @version 2.2.7
* @package WooCommerce\Classes\Emails
* @extends WC_Email
*/
class WC_Email_Customer_Order_Failed extends WC_Email
{
/**
* Constructor.
*/
public function __construct()
{
$this->id = 'custom_failed_order';
// add this to send to customer
$this->customer_email = true;
$this->title = 'This is a custom email template';
$this->description = 'You can modify this text to appear in the admin area';
// I'm pointing to a new template which I created in the THEME folder
// to use default email file should be admin-failed-order.php
$this->template_html = 'emails/customer-failed-order.php';
$this->template_plain = 'emails/plain/customer-failed-order.php';
$this->placeholders = array(
'{order_date}' => '',
'{order_number}' => '',
);
// Triggers for this email.
add_action('woocommerce_order_status_pending_to_failed_notification', array($this, 'trigger'), 10, 2);
add_action('woocommerce_order_status_on-hold_to_failed_notification', array($this, 'trigger'), 10, 2);
// Call parent constructor.
parent::__construct();
}
/**
* Get email subject.
*
* @since 3.1.0
* @return string
*/
public function get_default_subject()
{
return __('[{site_title}]: Order #{order_number} has failed', 'woocommerce');
}
/**
* Get email heading.
*
* @since 3.1.0
* @return string
*/
public function get_default_heading()
{
return __('Order Failed: #{order_number}', 'woocommerce');
}
/**
* Trigger the sending of this email.
*
* @param int $order_id The order ID.
* @param WC_Order|false $order Order object.
*/
public function trigger($order_id, $order = false)
{
$this->setup_locale();
if ($order_id && !is_a($order, 'WC_Order')) {
$order = wc_get_order($order_id);
}
if (is_a($order, 'WC_Order')) {
$this->object = $order;
// this is the correct place to get_billing_email() working
$this->recipient = $this->object->get_billing_email();
$this->placeholders['{order_date}'] = wc_format_datetime($this->object->get_date_created());
$this->placeholders['{order_number}'] = $this->object->get_order_number();
}
if ($this->is_enabled() && $this->get_recipient()) {
$this->send($this->get_recipient(), $this->get_subject(), $this->get_content(), $this->get_headers(), $this->get_attachments());
}
$this->restore_locale();
}
/**
* Get content html.
*
* @return string
*/
public function get_content_html()
{
return wc_get_template_html(
$this->template_html,
array(
'order' => $this->object,
'email_heading' => $this->get_heading(),
'additional_content' => $this->get_additional_content(),
'sent_to_admin' => false,
'plain_text' => false,
'email' => $this,
)
);
}
/**
* Get content plain.
*
* @return string
*/
public function get_content_plain()
{
return wc_get_template_html(
$this->template_plain,
array(
'order' => $this->object,
'email_heading' => $this->get_heading(),
'additional_content' => $this->get_additional_content(),
// remove sending to admin, there is another email that does that
'sent_to_admin' => false,
'plain_text' => true,
'email' => $this,
)
);
}
/**
* Default content to show below main email content.
*
* @since 3.7.0
* @return string
*/
public function get_default_additional_content()
{
return __('Hopefully they’ll be back. Read more about <a href="https://docs.woocommerce.com/document/managing-orders/">troubleshooting failed payments</a>.', 'woocommerce');
}
/**
* Initialise settings form fields.
*/
public function init_form_fields()
{
/* translators: %s: list of placeholders */
$placeholder_text = sprintf(__('Available placeholders: %s', 'woocommerce'), '<code>' . esc_html(implode('</code>, <code>', array_keys($this->placeholders))) . '</code>');
$this->form_fields = array(
'enabled' => array(
'title' => __('Enable/Disable', 'woocommerce'),
'type' => 'checkbox',
'label' => __('Enable this email notification', 'woocommerce'),
'default' => 'yes',
),
// no need to define recipients in the admin panel
// 'recipient' => array(
// 'title' => __('Recipient(s)', 'woocommerce'),
// 'type' => 'text',
// /* translators: %s: WP admin email */
// 'description' => sprintf(__('Enter recipients (comma separated) for this email. Defaults to %s.', 'woocommerce'), '<code>' . esc_attr(get_option('admin_email')) . '</code>'),
// 'placeholder' => '',
// 'default' => '',
// 'desc_tip' => true,
// ),
'subject' => array(
'title' => __('Subject', 'woocommerce'),
'type' => 'text',
'desc_tip' => true,
'description' => $placeholder_text,
'placeholder' => $this->get_default_subject(),
'default' => '',
),
'heading' => array(
'title' => __('Email heading', 'woocommerce'),
'type' => 'text',
'desc_tip' => true,
'description' => $placeholder_text,
'placeholder' => $this->get_default_heading(),
'default' => '',
),
'additional_content' => array(
'title' => __('Additional content', 'woocommerce'),
'description' => __('Text to appear below the main email content.', 'woocommerce') . ' ' . $placeholder_text,
'css' => 'width:400px; height: 75px;',
'placeholder' => __('N/A', 'woocommerce'),
'type' => 'textarea',
'default' => $this->get_default_additional_content(),
'desc_tip' => true,
),
'email_type' => array(
'title' => __('Email type', 'woocommerce'),
'type' => 'select',
'description' => __('Choose which format of email to send.', 'woocommerce'),
'default' => 'html',
'class' => 'email_type wc-enhanced-select',
'options' => $this->get_email_type_options(),
'desc_tip' => true,
),
);
}
}
}
return new WC_Email_Customer_Order_Failed();
在 Woocommerce 更新的情况下，您应该检查自定义文件是否已更新，并由您来保持兼容性:)