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/ 邮件通知/
function comment_mail_notify($comment_id) {
    $comment = get_comment($comment_id);
    if (!$comment) {
        return;
    }

    $content = $comment->comment_content;
    $match_count = preg_match_all('/<a href="#comment-([0-9]+)?" rel="nofollow">/si', $content, $matches);

    if ($match_count > 0) {
        foreach ($matches[1] as $parent_id) {
            send_comment_reply_notification($parent_id, $comment);
        }
    } elseif ($comment->comment_parent != '0') {
        $parent_id = $comment->comment_parent;
        send_comment_reply_notification($parent_id, $comment);
    }
}
add_action('comment_post', 'comment_mail_notify');

function send_comment_reply_notification($parent_id, $comment) {
    $admin_email = get_bloginfo('admin_email');
    $parent_comment = get_comment($parent_id);
    if (!$parent_comment) {
        return;
    }

    $author_email = $comment->comment_author_email;
    $to = trim($parent_comment->comment_author_email);
    $spam_confirmed = $comment->comment_approved;

    if ($spam_confirmed != 'spam' && $to != $admin_email && $to != $author_email && !empty($to)) {
        $wp_email = 'i@' . preg_replace('#^www\.#', '', strtolower($_SERVER['SERVER_NAME']));
        $subject = '您在 [' . get_option("blogname") . '] 的留言有了回應';
        $message = '
           

' . esc_html(trim($parent_comment->comment_author)) . ', 您好!

           

您曾在《' . esc_html(get_the_title($comment->comment_post_ID)) . '》的留言:
'
            . esc_html(trim($parent_comment->comment_content)) . '

           

' . esc_html(trim($comment->comment_author)) . ' 给你的回复:
'
            . esc_html(trim($comment->comment_content)) . '

           

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