插件43：可以自动返回的链接-优快云博客

本文链接：https://blog.youkuaiyun.com/manbujingxin/article/details/6921319

本文介绍了一个自动回链插件的功能，它接受一个文件名作为输入，该文件记录了所有链接到当前网页的网站信息。插件通过解析此文件，输出内部链接及其来源网址。

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<?php // Plug-in 43: Auto Back Links

$logfile = "refererlog";
echo "Referring URLs in logfile '$logfile':<br /><br />";

$results = PIPHP_AutoBackLinks($logfile);
if (!$results[0]) echo "No referring URLs";
else foreach ($results[1] as $result)
{
   $title = PIPHP_GetTitleFromURL($result);
   echo "<a href='$result'>";
   echo $title ? $title : $result;
   echo "</a><br />";
}

function PIPHP_AutoBackLinks($filename)
{
   // Plug-in 42: Auto Back Links
   //
   // This plug-in takes the filename of a log file, as
   // supplied to Plug-in 30, PIPHP_RefererLog(), and returns
   // a two element array where the first value is TRUE and
   // the second is an array of inbound links sorted by the
   // amount of hits received. If there are no links only a
   // single element array is returned, with the value FALSE.
   // The argument required is:
   //
   //    $filename: The name of a log file

   if (!file_exists($filename)) return array(FALSE);
   
   $inbound = array();
   $logfile = file_get_contents($filename);
   $links   = explode("\n", rtrim($logfile));
   $links   = array_count_values($links);
   arsort($links, SORT_NUMERIC);
   
   foreach ($links as $key => $val)
      if ($key != " No Referer")
         $inbound[] = $key;

   return array(TRUE, $inbound);
}

// The function below is repeated here to ensure that the
// main function (which relies on it) has access to it

function PIPHP_GetTitleFromURL($page)
{
   // Plug-in 42: Get Title From URL
   //
   // This plug-in takes the URL of a web page and returns that
   // page's title. If the page cannot be loaded then FALSE is
   // returned. The argument required is:
   //
   //    $page: The URL of a page, including the preceding
   //           http://

   $contents = @file_get_contents($page);
   if (!$contents) return FALSE;
   
   preg_match("/<title>(.*)<\/title>/i", $contents, $matches);

   if (count($matches)) return $matches[1];
   else return FALSE;
}

?>

插件说明：

本插件接受一个文件名，他保存了所有链接到当前网页的网站的详细信息。这个文件名由插件30的PIPHP_RefererLog()函数创建的。

本插件需要以下参数

$filename 文件名或路径