$badUserAgents = array(
    'okhttp', 
    'Aboundex', 
    'BotALot', 
    'Grafula', 
    'Ltx71', 
    'Nmap', 
    'SBIder', 
    'Telesphoreo', 
    'TightTwatBot', 
    'Virusdie', 
    'Web Collage', 
    'scan.lol', 
    'Acunetix', 
    'CATExplorador', 
    'Heritrix', 
    'MegaIndex', 
    'Nuclei', 
    'SpankBot', 
    'TheNomad', 
    'Trendictionbot', 
    'WWWOFFLE', 
    'check1', 
    'trendiction', 
    'BlackWidow', 
    'Dispatch', 
    'JetCar', 
    'NICErsPRO', 
    'OutfoxBot', 
    'Szukacz', 
    'Thumbor', 
    'VeriCiteCrawler', 
    'Wallpapers', 
    'ripz', 
    'ubermetrics'
    );
$agent = strtolower($_SERVER['HTTP_USER_AGENT']); 
$badAgents = strtolower($badUserAgents); 
foreach ($badAgents as $value) { 
    if (strpos($agent, $value) !== false) {
        header("HTTP/1.1 403 Forbidden");
        die("Hacking attempt!");
    }
}