编辑“WordPress设计Error 404页面”（章节）

==改进错误页面小技巧==
有很多方法可以改善404错误页面，下面介绍其中几种。

===传送准确的页头信息===

默认情况下WordPress按照正常网页形式传输404页面。为了让Google等搜索引擎正确索引404页面，我们可以在当前主题404.php文件的最上方加入以下代码。

注意：在最新版本的WordPress无需进行此操作。

 <?php header("HTTP/1.1 404 Not Found"); ?>  
 <?php header("Status: 404 Not Found"); ?>  
有时还需要在上述代码前加入以下代码：
 <?php ob_start(); ?>  

===编写友好的错误信息===

我们可以在错误页面上显示各种内容，告诉读者，他们遇到的只是一个很小的问题，我们正尽最大努力帮助他们查找他们需要的信息。例如，我们可以这样说：

 "Oops, I screwed up and you discovered my fatal flaw. 
 Well, we're not all perfect, but we try.  Can you try this
 again or maybe visit our <a 
 title="Our Site" href="http://example.com/index.php">Home 
 Page</a> to start fresh.  We'll do better next time."

同时还要尝试找出用户真正需要的信息。下载 [http://www.askapache.com/seo/404-google-wordpress-plugin.html AskApache   Google 404 Plugin]插件，为404.php页面添加Google搜索结果。

当然也可以说一些简短而亲切的话。无论怎样，几乎所有都比<STRONG>404 Error Page Not   Found</STRONG>看上去要好的多。在互联网上可以找到很多编写404错误页面的资料，比如 [http://www.alistapart.com/articles/perfect404/ List Apart's Perfect   404]。

作为一个完美的404页面，[http://www.alistapart.com/articles/perfect404/ List Apart's Perfect   404]告诉访问者，出现这个页面并不是他们的错，如果的确是由他们的错误导致404页面出现，请发送电子邮件给网站管理员描述详细情况。

404页面有时非常恼人，也没有帮助性。利用WordPress工具可以削弱404页面的负面影响，给访问者带来有价值有帮助的信息，同时访问者通过某个链接来到一个实际并不存在的页面时，如果能给我们邮件通知，这对我们也有很大帮助。

 < p>You 
 <?php
 #some variables for the script to use
 #if you have some reason to change these, do.  but wordpress can handle it
 $adminemail = get_bloginfo('admin_email'); #the administrator email address, according to wordpress
 $website = get_bloginfo('url'); #gets your blog's url from wordpress
 $websitename = get_bloginfo('name'); #sets the blog's name, according to wordpress
  if (!isset($_SERVER['HTTP_REFERER'])) {
    #politely blames the user for all the problems they caused
        echo "tried going to "; #starts assembling an output paragraph
        $casemessage = "All is not lost!";
  } elseif (isset($_SERVER['HTTP_REFERER'])) {
    #this will help the user find what they want, and email me of a bad link
 echo "clicked a link to"; #now the message says You clicked a link to...
        #setup a message to be sent to me
 $failuremess = "A user tried to go to $website"
        .$_SERVER['REQUEST_URI']." and received a 404 (page not found) error. ";
 $failuremess .= "It wasn't their fault, so try fixing it.  
        They came from ".$_SERVER['HTTP_REFERER'];
 mail($adminemail, "Bad Link To ".$_SERVER['REQUEST_URI'],
        $failuremess, "From: $websitename <noreply@$website>"); #email you about problem
 $casemessage = "An administrator has been emailed 
        about this problem, too.";#set a friendly message
  }
  echo " ".$website.$_SERVER['REQUEST_URI']; ?> 
 and it doesn't exist. <?php echo $casemessage; ?>  You can click back 
 and try again or search for what you're looking for:
  <?php include(TEMPLATEPATH . "/searchform.php"); ?>
 < /p>

'''添加实用链接'''

在WordPress官方网站上遇到“页面未找到”页面时，页面上会显示该网站内多个链接，将用户指向其它分类信息。404页面地址——http://wordpress.org/brokenlink.php。

如果我们要在404页面上添加类似的实用链接，只要新建一个链接列表或一段文字，访问者可以从中选择自己需要的链接。这比把访问者带到死角上要好多了。怎样让404页面上的链接指向网站中的文档，尤其是[http://www.wordpress.la/codex-%E9%A1%B5%E9%9D%A2%E7%9A%84%E5%88%9B%E5%BB%BA%E5%92%8C%E4%BD%BF%E7%94%A8.html 页面]和分类文档，请看[http://www.wordpress.la/codex-%E5%86%85%E5%AE%B9%E9%93%BE%E6%8E%A5.html 内容链接]。
说明	输入内容	输出结果
斜体	''斜体文字''	斜体文字
粗体	'''粗体文字'''	粗体文字
粗斜体	'''''粗斜体文字'''''	*粗斜体文字*