图片防盗链功能

<?php
 
$admin[defaulturl] = "img/no.gif";//盗链返回的地址
$okaysites = array("http://www.5v6.com/","http://t.5v6.com/");  //白名单  
$admin[url_1] = "http://t.5v6.com/";//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]");
}
 
?>