WordPress评论邮件通知

由两个帖子内容中的代码整合而来，应用于原生主题twenty fifteen

/* 评论邮件回复开始 Twenty Fifteen */
function comment_mail_notify($comment_id) {
  $admin_notify = '1'; // admin 要不要收回复通知 ( '1'=要 ; '0'=不要 )
  $admin_email = get_bloginfo ('admin_email'); // $admin_email 可改为你指定的 e-mail.
  $comment = get_comment($comment_id);
  $comment_author_email = trim($comment->comment_author_email);
  $parent_id = $comment->comment_parent ? $comment->comment_parent : '';
  global $wpdb;
  if ($wpdb->query("Describe {$wpdb->comments} comment_mail_notify") == '')
    $wpdb->query("ALTER TABLE {$wpdb->comments} ADD COLUMN comment_mail_notify TINYINT NOT NULL DEFAULT 0;");
  if (($comment_author_email != $admin_email && isset($_POST['comment_mail_notify'])) || ($comment_author_email == $admin_email && $admin_notify == '1'))
    $wpdb->query("UPDATE {$wpdb->comments} SET comment_mail_notify='1' WHERE comment_ID='$comment_id'");
  $notify = $parent_id ? get_comment($parent_id)->comment_mail_notify : '0';
  $spam_confirmed = $comment->comment_approved;
  if ($parent_id != '' && $spam_confirmed != 'spam' && $notify == '1') {
    $wp_email = 'no-reply@' . preg_replace('#^www.#', '', strtolower($_SERVER['SERVER_NAME'])); // e-mail 发出点, no-reply 可改为可用的 e-mail.
    $to = trim(get_comment($parent_id)->comment_author_email);
    $subject = '您在 [' . get_option("blogname") . '] 的留言有了回复';
    $message = '
    <div style="color:#555;font:12px/1.5 微软雅黑,Tahoma,Helvetica,Arial,sans-serif;max-width:550px;margin:50px auto;border-top: none;" ><table border="0" cellspacing="0" cellpadding="0"><tbody><tr valign="top" height="2"><td valign="top"><div style="background-color:white;border-top:2px solid #00A7EB;box-shadow:0 1px 3px #AAAAAA;12px;max-width:550px;color:#555555;font-family:微软雅黑, Arial;;font-size:12px;">
    <h2 style="border-bottom:1px solid #DDD;font-size:14px;font-weight:normal;padding:8px 0 10px 8px;"><span style="color: #00A7EB;font-weight: bold;">> </span>您的留言有回复啦！</h2><div style="padding:0 12px 0 12px;margin-top:18px">
      <p>' . trim(get_comment($parent_id)->comment_author) . ', 您好!</p>
      <p>您曾在《' . get_the_title($comment->comment_post_ID) . '》的留言:</p>
      <p style="background-color: #EEE;border: 1px solid #DDD;padding: 20px;margin: 15px 0;">' . trim(get_comment($parent_id)->comment_content) . '</p>
       
      <p>' . trim($comment->comment_author) . ' 给您的回复:</p>
      <p style="background-color: #EEE;border: 1px solid #DDD;padding: 20px;margin: 15px 0;">' . trim($comment->comment_content) . '</p>
      
      <p>您可以点击 <a style="text-decoration:none; color:#5692BC" href="' . htmlspecialchars(get_comment_link($parent_id)) . '">查看完整的回复內容</a>，也欢迎再次光临 <a style="text-decoration:none; color:#5692BC"
href="' . home_url() . '">' . $blogname . '</a>。祝您生活愉快！</p>
<p style="padding-bottom: 15px;">(此邮件由系统自动发出,请勿直接回复!)</p>
    </div>';
         $from = "From: \"" . get_option('blogname') . "\" <$wp_email>";
         $headers = "$from\nContent-Type: text/html; charset=" . get_option('blog_charset') . "\n";
         wp_mail( $to, $subject, $message, $headers );
  }
}
add_action('comment_post', 'comment_mail_notify');
 
/* 评论邮件回复自动加勾选栏 */
function add_checkbox() {
  echo '<input type="checkbox" name="comment_mail_notify" id="comment_mail_notify" value="comment_mail_notify" checked="checked" style="margin-left:20px;" /><label for="comment_mail_notify">有人回复时邮件通知我</label>';
}
add_action('comment_form', 'add_checkbox');

参考

WordPress 评论回复邮件通知代码
WordPress添加评论回复邮件提醒通知功能