代码实现修改WordPress评论留言通知邮件模板样式

WordPress 默认的评论模板中是带有邮件通知的功能的，但我们使用的主题一般是开发者写的，假如不喜欢邮件模板怎么修改？下面讲一讲 WordPress 的邮件通知实现过程，想修改邮件模板也很简单。

//评论回应邮件通知
add_action('comment_post', '_comment_mail_notify');
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 = 'Hi，您在 [' . get_option("blogname") . '] 的留言有人回复啦！';
$letter = (object) array(
'author' => trim(get_comment($parent_id)->comment_author),
'post' => get_the_title($comment->comment_post_ID),
'comment' => trim(get_comment($parent_id)->comment_content),
'replyer' => trim($comment->comment_author),
'reply' => trim($comment->comment_content),
'link' => HTMLspecialchars(get_comment_link($parent_id)),
'sitename' => get_option('blogname')
);
$message = '
<table width="100%" cellpadding="0" cellspacing="0" border="0" style="border-collapse:collapse"><tbody><tr><td><table width="600" cellpadding="0" cellspacing="0" border="0" align="center" style="border-collapse:collapse"><tbody><tr><td><table width="100%" cellpadding="0" cellspacing="0" border="0"><tbody><tr><td width="73" align="left" valign="top" style="border-top:1px solid #d9d9d9;border-left:1px solid #d9d9d9;border-radius:5px 0 0 0"></td><td valign="top" style="border-top:1px solid #d9d9d9"><div style="font-size:14px;line-height:10px"><br><br><br><br></div><div style="font-size:18px;line-height:18px;color:#444;font-family:Microsoft Yahei">Hi, ' . $letter->author . '<br><br><br></div><div style="font-size:14px;line-height:22px;color:#444;font-weight:bold;font-family:Microsoft Yahei">您在' . $letter->sitename . '《' . $letter->post . '》的评论：</div><div style="font-size:14px;line-height:10px"><br></div><div style="font-size:14px;line-height:22px;color:#666;font-family:Microsoft Yahei">       ' . $letter->comment . '</div><div style="font-size:14px;line-height:10px"><br><br></div><div style="font-size:14px;line-height:22px;color:#5DB408;font-weight:bold;font-family:Microsoft Yahei">' . $letter->replyer . ' 回复您：</div><div style="font-size:14px;line-height:10px"><br></div><div style="font-size:14px;line-height:22px;color:#666;font-family:Microsoft Yahei">       ' . $letter->reply . '</div><div style="font-size:14px;line-height:10px"><br><br><br><br></div><div style="text-align:center"><a href="' . $letter->link . '" target="_blank" style="text-decoration:none;color:#fff;display:inline-block;line-height:44px;font-size:18px;background-color:#61B3E6;border-radius:3px;font-family:Microsoft Yahei">      点击查看回复      </a><br><br></div></td><td width="65" align="left" valign="top" style="border-top:1px solid #d9d9d9;border-right:1px solid #d9d9d9;border-radius:0 5px 0 0"></td></tr><tr><td style="border-left:1px solid #d9d9d9"> </td><td align="left" valign="top" style="color:#999"><div style="font-size:8px;line-height:14px"><br><br></div><div style="min-height:1px;font-size:1px;line-height:1px;background-color:#e0e0e0"> </div><div style="font-size:12px;line-height:20px;width:425px;font-family:Microsoft Yahei"><br><a href="' . _hui('letter_link_1') . '" target="_blank" style="text-decoration:underline;color:#61B3E6;font-family:Microsoft Yahei" rel="noopener noreferrer">' . _hui('letter_text_1') . '</a><br><a href="' . _hui('letter_link_2') . '" target="_blank" style="text-decoration:underline;color:#61B3E6;font-family:Microsoft Yahei" rel="noopener noreferrer">' . _hui('letter_text_2') . '</a><br>此邮件由' . $letter->sitename . '系统自动发出，请勿回复！</div></td><td style="border-right:1px solid #d9d9d9"> </td></tr><tr><td colspan="3" style="border-bottom:1px solid #d9d9d9;border-right:1px solid #d9d9d9;border-left:1px solid #d9d9d9;border-radius:0 0 5px 5px"><div style="min-height:42px;font-size:42px;line-height:42px"> </div></td></tr></tbody></table></td></tr><tr><td><div style="min-height:42px;font-size:42px;line-height:42px"> </div></td></tr></tbody></table></td></tr></tbody></table>';
$from = "From: \"" . get_option('blogname') . "\" <$wp_email>";
$headers = "$from\nContent-Type: text/html; charset=" . get_option('blog_charset') . "\n";
wp_mail($to, $subject, $message, $headers);
//echo 'mail to ', $to, '<br/> ' , $subject, $message; // for testing
}
}
//自动勾选
add_action('comment_form', '_comment_add_checkbox');
function _comment_add_checkbox() {
echo '<label for="comment_mail_notify" class="checkbox inline hide" style="padding-top:0"><input type="checkbox" name="comment_mail_notify" id="comment_mail_notify" value="comment_mail_notify" checked="checked"/>有人回复时邮件通知我</label>';
}