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function checkRef(){

if(isset($_SERVER['HTTP_REFERER']) && $_SERVER['HTTP_REFERER'] !== null && $_SERVER['HTTP_REFERER'] !== '') {

$referrer = $_SERVER['HTTP_REFERER'];

$referrer = htmlspecialchars($referrer);

if(strpos($referrer,"bitsforclicks")!==false || strpos($referrer,"ads4btc")!==false || strpos($referrer,"bitptc")!==false || strpos($referrer,"btcclicks")!==false)

die('no traffic from PTC Sites allowed!');

}

}

function checkVisitor($ip){

$query = @unserialize(file_get_contents('http://ip-api.com/php/'.$ip));

if($query && $query['status'] == 'success') {

if(strpos($query['isp'],'Leaseweb')!==false) { return true; }

} else { return false;}

}