PHP anti-hotlink function example code

Today’s Internet has a lot of collection websites, and many websites like to hotlink/steal pictures from other people’s websites. This not only infringes on network rights, but also causes the websites to be hotlinked to consume a lot of traffic, giving rise to The server puts a lot of pressure on the server. This article introduces two methods on how to prevent image theft/hotlinking in PHP. Friends in need can refer to it.

What is the use of anti-hotlinking for pictures? It prevents other websites from stealing your pictures and wasting your precious traffic.

This article mainly introduces the implementation method of PHP anti-hotlinking. It is a very practical skill. Friends who need it can refer to it

Anti-hotlinking is a very common web programming design at present. Skill. This article uses an example to demonstrate the implementation method of PHP anti-hotlinking. The specific method is as follows:

/*
使用方法:将上述代码保存为dao4.php,
比如测试用的validatecode.rar在站点http://www.XXXX.com里面,
则用以下代码表示下载连接.
文件名?site=1&file=文件 
例如以下URL：
http://www.XXXX.cn/dao4.php?site=1&file=validatecode.rar 
*/
$ADMIN[defaulturl] = "http://www.XXXX.com/404.htm"; //盗链返回的地址
$okaysites = array(
  "http://www.XXXX.com/",
  "http://XXXX.com"
); //白名单
$ADMIN[url_1] = "http://www.XXXX.com/download/"; //下载地点1
$ADMIN[url_2] = ""; //下载地点2，以此类推
$reffer = $HTTP_REFERER;
if ($reffer) {
  $yes = 0;
  while (list($domain, $subarray) = each($okaysites)) {
    if (ereg($subarray, "$reffer")) {
      $yes = 1;
    }
  }
  $theu = "url" . "_" . "$site";
  if ($ADMIN[$theu] AND $yes == 1) {
    header("Location: $ADMIN[$theu]/$file");
  } else {
    header("Location: $ADMIN[defaulturl]");
  }
} else {
  header("Location: $ADMIN[defaulturl]");
}
?>

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