自定义字段从新订单电子邮件Woocomerce中消失

Question

我通过在functions.php中执行echo添加了一些自定义表单字段，并按照一些示例在电子邮件中设置自定义表单字段，但最近他们停止在电子邮件中显示，尽管我在自定义字段部分中按顺序详细信息获取所有这些字段。

以下是functions.php代码

字段回显代码

/**
* Email include "Metadata" on Order Emails
*
*/

    add_filter( 'woocommerce_email_order_meta_keys', 'xcsn_woocommerce_email_order_meta_keys' );

    function xcsn_woocommerce_email_order_meta_keys( $keys ) {

        global $post;
        $post_id = $post->ID;

    //For Package 1

        if ( !empty( $post_id )) {

            // Check the POST data is being submitted
            if ( $_POST['acc1user'] ) {

        $keys[] = 'acc1user';

                // Writes directly into the email body
                echo '<h2>Instagram Account No.1 Username</h2>';

                $my_test_field_output = sanitize_text_field( $_POST['acc1user']  );
                echo '<p>' . $my_test_field_output . '</p>';
            }

        if ( $_POST['acc1pass'] ) {

        $keys[] = 'acc1pass';

                // Writes directly into the email body
                echo '<h2>Instagram Account No.1 Password</h2>';

                $my_test_field_output = sanitize_text_field( $_POST['acc1pass'] );
                echo '<p>' . $my_test_field_output . '</p>';
            echo '</br>';
            }

    if ( $_POST['acc1audi'] ) {

        $keys[] = 'acc1audi';

                // Writes directly into the email body
                echo '<h2>Instagram Account No.1 Audience</h2>';

                $my_test_field_output = sanitize_text_field( $_POST['acc1audi'] );
                echo '<p>' . $my_test_field_output . '</p>';
            echo '</br>';
            }

          }     
        return $keys;
    }

包括电子邮件代码中的元订单

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