当用户的文章在WordPress中发布时，向用户发送邮件通知.为什么是多次?

Question

我有一个WordPress网站，用户可以从前端发布，状态为草稿。

现在当我从管理面板发布帖子时，通知电子邮件发送了不止一次。我需要发一次邮件。

我的代码下面:

if (is_admin()) {
function notifyauthor($post_id) { 
$post = get_post($post_id);
$author = get_userdata($post->post_author);
$subject = "Post publish notification";
$headers = 'From: '.get_bloginfo( 'name' ).' <[e-mail]>' . "rn";
$message = "
Hi ".$author->display_name.",

Your post, "".$post->post_title."" has just been published.

View post: ".get_permalink( $post_id )."

Thank You, Admin"
;

wp_mail($author->user_email, $subject, $message, $headers);
}
add_action('publish_post', 'notifyauthor');
}

我尝试了current_user_can('administrator')而不是is_admin()，但我得到了相同的结果。

Answer 1

许多钩子实际上会运行不止一次。简单的解决方案是在第一次迭代之后通过post_meta添加一个计数器，然后检查它是否存在。

function notifyauthor($post_id) {
if (is_admin() && !(metadata_exists('post', $post_id, 'sent_notification_email'))) {
$post = get_post($post_id);
$author = get_userdata($post->post_author);
$subject = "Post publish notification";
$headers = 'From: '.get_bloginfo( 'name' ).' <[e-mail]>' . "rn";
$message = "
Hi ".$author->display_name.",

Your post, "".$post->post_title."" has just been published.

View post: ".get_permalink( $post_id )."

Thank You, Admin";
wp_mail($author->user_email, $subject, $message, $headers);
// Set a meta key as a counter
update_post_meta($post_id, 'sent_notification_email', '1');
}
}
add_action('publish_post', 'notifyauthor');