PHP仿盗链代码

<?php
/**
* @author seraphim
* @copyright 2012
*/
$ADMIN = array(
defaulturl=> http://www.xx.com/images/banner-header.gif, //盗链返回的地址
url_1 => http://www.xx.net/file,
url_2 => http://www.xx.net/file1,
);
$okaysites = array(
http://box.baidu.com,
http://tieba.baidu.com/p/1493336008, //白名单
http://www.xx.com/1.html,
);
$reffer = $_SERVER[HTTP_REFERER];
if ($reffer) {
$yes = 0;
while (list($domain, $subarray) = each($okaysites)) {
if (ereg($subarray, "$reffer")) {
$yes = 1;
}
}
$theu = url_ . $_GET[site];
$file = $_GET[file];
if ($ADMIN[$theu] and $yes == 1) {
header("Location: $ADMIN[$theu]/$file");
} else {
header("Location: $ADMIN[defaulturl]");
}
} else {
header("Location: $ADMIN[defaulturl]");
}
print_r($_SERVER[HTTP_REFERER]);
?>