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;}
}