从WordPress函数中获取价值

Question

我对WordPress有点陌生，我有一个小问题。

我正在检查我的邮件是否已发送，我想将此信息保存在我创建的自定义表中。我需要在其他函数中检索此信息，然后将其保存在自定义表中。

这是我检查邮件是否已发送的功能。

/*
 * Send notification when stock is low
 */

function boilerplate_custom_low_stock_notification( $order ) {

foreach ( $order->get_items() as $item ) {
    print_r($item);

    if ( $item->is_type( 'line_item' ) && ( $product = $item->get_product() ) && $product->managing_stock() ) {

        $new_stock = get_post_meta( $product->get_id(), '_stock', true );
        $minimum_stock = get_post_meta( $product->get_id(), '_stock_minimum', true );

        $stock = $product->get_stock_quantity();
        $name = $product->get_name();

        if ( $new_stock <= $minimum_stock ) {

            //Send email to admin
            $notification = wp_insert_post(
                array(
                    'post_type'     => 'shop_history',
                    'post_title'    => 'The stock of '. $name . ' is running low.',
                    'post_content'  => 'The stock is running low. There are only ' . $stock . " pieces left.",
                    'post_status'   => 'publish',
                ) );

            $mailResult = false;
            $mailResult = wp_mail( get_option('admin_email'), 'Your stock is running low', 'The stock of ' . $name . ' is running low. You have ' . $stock . ' piece(s) left.' );

            if( $mailResult == true){
                $mail_send = "Mail was send";
            }else{
                $mail_send = "Something went wrong en there was no mail send";
            }
            //error_log( $mail_send );

            return $notification;

            }
        }
    }
}
add_action( 'woocommerce_reduce_order_stock', 'boilerplate_custom_low_stock_notification', 10, 3 );

在此功能中，我要保存信息。

/*
 * Add values to column
 */
function woocommerce_shop_history_mail_column( $column, $post_id ) {

    switch ( $column ) {
        case 'mail' :
            echo 'Is my mail send or not?';
            break;
    }
}

add_filter( 'manage_shop_history_posts_custom_column', 'woocommerce_shop_history_mail_column', 10, 2 );