兩種PHP防盜鏈方法

$ADMIN[defaulturl] = "http://jb51.net/404.htm";//盗链返回的地址 
$okaysites = array("http://jb51.net/","http://www.jb51.net"); //白名单 
$ADMIN[url_1] = "http://jb51.net/temp/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]"); 
} 
?>