WordPress中wp_mail重复发送邮件问题求助

这个问题其实挺常见的，核心原因在于你用的delete_post钩子在WordPress里会被触发两次：一次是文章被移至回收站时，另一次是文章被永久删除（不管是手动删除还是回收站自动清理）时。这就导致你的authorNotification函数被执行了两遍，自然会发两封一模一样的邮件。

下面给你两个靠谱的解决方案：

方案1：用更精准的钩子（推荐） #

WordPress提供了细分的钩子来区分不同的删除动作，完全可以避开重复触发的问题：

• trashed_post：只在文章被移到回收站时触发一次，这通常就是管理员“删除”文章的场景，正好匹配你发“文章被拒绝”通知的需求
• deleted_post：只在文章被永久删除时触发一次

把钩子换成trashed_post就能直接解决问题，同时我还加了一些健壮性优化：

function authorNotification($post_id) {
    // 跳过自动草稿和修订版，避免无意义的触发
    if (get_post_status($post_id) === 'auto-draft' || wp_is_post_revision($post_id)) {
        return;
    }

    $post = get_post($post_id);
    $author = get_userdata($post->post_author);
    
    // 确保能获取到作者信息，防止出现PHP报错
    if (!$author) {
        return;
    }

    $message = " Hi " . $author->display_name . ", We are sorry to inform you that your article, " . $post->post_title . " has been declined. We strongly recommend you to go through the guest posting guidelines before you submit an article again. ";
    wp_mail($author->user_email, "Declined", $message);
}
add_action('trashed_post', 'authorNotification');

方案2：添加重复发送防护机制 #

如果你因为某些原因必须使用delete_post钩子，可以通过临时缓存（transient）来限制短时间内重复发送：

function authorNotification($post_id) {
    // 跳过自动草稿和修订版
    if (get_post_status($post_id) === 'auto-draft' || wp_is_post_revision($post_id)) {
        return;
    }

    // 检查该文章的通知是否已经发送过
    $email_sent_key = 'declined_email_' . $post_id;
    if (get_transient($email_sent_key)) {
        return;
    }

    $post = get_post($post_id);
    $author = get_userdata($post->post_author);
    
    if (!$author) {
        return;
    }

    $message = " Hi " . $author->display_name . ", We are sorry to inform you that your article, " . $post->post_title . " has been declined. We strongly recommend you to go through the guest posting guidelines before you submit an article again. ";
    wp_mail($author->user_email, "Declined", $message);

    // 设置1小时的缓存，防止重复发送（时间可以根据需求调整）
    set_transient($email_sent_key, true, 3600);
}
add_action('delete_post', 'authorNotification');

内容的提问来源于stack exchange，提问作者Adham Mohamed