Summary of common methods to prevent hotlinking in PHP_PHP tutorial

$ADMIN[defaulturl] = "http://jb51. net/404.htm";//The address returned by the hot link
$okaysites = array("http://jb51.net/","http://www.jb51.net"); //Whitelist
$ADMIN[url_1] = "http://jb51.net/temp/download/";//Download location 1
$ADMIN[url_2] = "";//Download location 2, and so on

$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]");
}

? >

//Place the root directory of the downloaded software relative to the current script directory
$fileRelPath = "../../software";
//Exception allowed URL for connection , Note: You do not need to fill in your own domain name, set it to be sure to download,
// Empty string ("") indicates the situation of directly entering the URL to download
$excludeReferArr = array("www.wjb51.net ", "wjb51.net");

chdir($fileRelPath);
$fileRootPath = getcwd() ."/";

$filePath=$HTTP_GET_VARS["file" ];

$url=parse_url($_SERVER["HTTP_REFERER"]);

if($url[host]!=$_SERVER["HTTP_HOST"] && !in_array($referHost , $excludeReferArr)){
?>