$geturl = "http://www.kuitao8.com/20140924/3096.shtml";
if(isset($geturl)&&!empty($geturl)){
    $fromHost = array(
        'kuitao8.com'
    );
    $urlArr = parse_url($geturl);
    $host = isset($urlArr['host'])?$urlArr['host']:'';
    $host = strtolower(str_ireplace('www.','',$host));
    if(!in_array($host,$fromHost)){
        echo "禁止访问";
    } else {
        echo "正常访问";
    }

}