PHP Bot or Crawler Detection Functions

function is_bot() {
   if(preg_match('/bot|crawl|spider|mediapartners|slurp|patrol/i', $_SERVER['HTTP_USER_AGENT'])) {
      return true;
   }
   if (strpos($_SERVER['HTTP_USER_AGENT'], 'Headless') !== false) {
      return true;
   }
   return false;
}

function is_bot_long() {
   $crawlers_agents = array(
      'Bloglines subscribe',
      'DumbotSosoimagespider',
      'QihooBot',
      'FAST-WebCrawler',
      'Superdownloads Spiderman',
      'LinkWalker',
      'msnbot',
      'ASPSeek',
      'WebAlta Crawler',
      'Lycos',
      'FeedFetcher-Google',
      'Yahoo',
      'YoudaoBot',
      'AdsBot-Google',
      'Googlebot',
      'Scooter',
      'Gigabot',
      'Charlotte',
      'eStyle',
      'AcioRobot',
      'GeonaBot',
      'msnbot-media',
      'Baidu',
      'CocoCrawler',
      'Google',
      'Charlotte t',
      'Yahoo! Slurp China',
      'Sogou web spider',
      'YodaoBot',
      'MSRBOT',
      'AbachoBOT',
      'Sogou head spider',
      'AltaVista',
      'IDBot',
      'Sosospider',
      'Yahoo! Slurp',
      'Java VM',
      'DotBot',
      'LiteFinder',
      'Yeti',
      'Rambler',
      'Scrubby',
      'Baiduspider',
      'accoona',
      // https://github.com/JayBizzle/Crawler-Detect
      '.*Java.*outbrain',
      ' YLT',
      '008\/',
      '192\.comAgent',
      '2ip\.ru',
      '404checker',
      '404enemy',
      '80legs',
      '^b0t$',
      '^bluefish',
      '^Calypso v\/',
      '^COMODO DCV',
      '^DangDang',
      '^DavClnt',
      '^FDM ',
      '^git\/',
      '^Goose\/',
      '^Grabber',
      '^HTTPClient\/',
      '^Java\/',
      '^Jeode\/',
      '^Jetty\/',
      '^Mail\/',
      '^Mget',
      '^Microsoft URL Control',
      '^NG\/[0-9\.]',
      '^NING\/',
      '^PHP\/[0-9]',
      '^RMA\/',
      '^Ruby|Ruby\/[0-9]',
      '^scrutiny\/',
      '^VSE\/[0-9]',
      '^WordPress\.com',
      '^XRL\/[0-9]',
      '^ZmEu',
      'a3logics\.in',
      'A6-Indexer',
      'a\.pr-cy\.ru',
      'Abonti',
      'Aboundex',
      'aboutthedomain',
      'Accoona-AI-Agent',
      'acoon',
      'acrylicapps\.com\/pulp',
      'Acunetix',
      'AdAuth\/',
      'adbeat',
      'AddThis',
      'ADmantX',
      'adressendeutschland',
      'adscanner\/',
      'Advanced Email Extractor v',
      'agentslug',
      'AHC',
      'aihit',
      'aiohttp\/',
      'Airmail',
      'akka-http\/',
      'akula\/',
      'alertra',
      'alexa site audit',
      'Alibaba\.Security\.Heimdall',
      'Alligator',
      'allloadin\.com',
      'AllSubmitter',
      'alyze\.info',
      'amagit',
      'Anarchie',
      'AndroidDownloadManager',
      'Anemone',
      'AngleSharp\/',
      'Ant\.com',
      'Anturis Agent',
      'AnyEvent-HTTP\/',
      'Apache Droid',
      'Apache-HttpAsyncClient\/',
      'Apache-HttpClient\/',
      'ApacheBench\/',
      'Apexoo',
      'APIs-Google',
      'AportWorm\/[0-9]',
      'AppBeat\/[0-9]',
      'AppEngine-Google',
      'AppStoreScraperZ',
      'Arachmo',
      'arachnode',
      'Arachnophilia',
      'aria2',
      'Arukereso',
      'asafaweb.com',
      'AskQuickly',
      'ASPSeek',
      'Asterias',
      'Astute',
      'asynchttp',
      'Attach',
      'autocite',
      'Autonomy',
      'axios\/',
      'B-l-i-t-z-B-O-T',
      'Backlink-Ceck',
      'backlink-check',
      'BackStreet',
      'BackWeb',
      'Bad-Neighborhood',
      'Badass',
      'baidu\.com',
      'Bandit',
      'BatchFTP',
      'Battleztar\ Bazinga',
      'baypup\/[0-9]',
      'baypup\/colbert',
      'BazQux',
      'BBBike',
      'BCKLINKS',
      'BDFetch',
      'BegunAdvertising\/',
      'BigBozz',
      'Bigfoot',
      'biglotron',
      'BingLocalSearch',
      'BingPreview',
      'binlar',
      'biNu image cacher',
      'Bitacle',
      'biz_Directory',
      'Black\ Hole',
      'Blackboard Safeassign',
      'BlackWidow',
      'Bloglovin',
      'BlogPulseLive',
      'BlogSearch',
      'Blogtrottr',
      'BlowFish',
      'Boardreader',
      'boitho\.com-dc',
      'BPImageWalker',
      'Braintree-Webhooks',
      'Branch Metrics API',
      'Branch-Passthrough',
      'Brandprotect',
      'Brandwatch',
      'Brodie\/',
      'Browsershots',
      'BUbiNG',
      'Buck\/',
      'Buddy',
      'BuiltWith',
      'Bullseye',
      'BunnySlippers',
      'Burf Search',
      'Butterfly\/',
      'BuzzSumo',
      'CAAM\/[0-9]',
      'CakePHP',
      'Calculon',
      'CapsuleChecker',
      'CaretNail',
      'catexplorador',
      'cb crawl',
      'CC Metadata Scaper',
      'Cegbfeieh',
      'Cerberian Drtrs',
      'CERT\.at-Statistics-Survey',
      'cg-eye',
      'changedetection',
      'ChangesMeter\/',
      'Charlotte',
      'CheckHost',
      'checkprivacy',
      'CherryPicker',
      'ChinaClaw',
      'Chirp\/[0-9]',
      'chkme\.com',
      'Chlooe',
      'CirrusExplorer\/',
      'CISPA Vulnerability Notification',
      'Citoid',
      'CJNetworkQuality',
      'Clarsentia',
      'clips\.ua\.ac\.be',
      'Cloud\ mapping',
      'CloudEndure',
      'CloudFlare-AlwaysOnline',
      'Cloudinary\/[0-9]',
      'cmcm\.com',
      'coccoc',
      'cognitiveseo',
      'colly -',
      'CommaFeed',
      'Commons-HttpClient',
      'Comodo SSL Checker',
      'contactbigdatafr',
      'contentkingapp',
      'convera',
      'CookieReports\.com',
      'copyright sheriff',
      'CopyRightCheck',
      'Copyscape',
      'Cosmos4j\.feedback',
      'Covario-IDS',
      'CrawlForMe\/[0-9]',
      'Crescent',
      'cron-job\.org',
      'Crowsnest',
      'CSHttp',
      'curb',
      'Curious George',
      'curl',
      'cuwhois\/[0-9]',
      'cybo\.com',
      'DareBoost',
      'DatabaseDriverMysqli',
      'DataCha0s',
      'DataparkSearch',
      'dataprovider',
      'DataXu',
      'Daum(oa)?[ \/][0-9]',
      'Demon',
      'DeuSu',
      'developers\.google\.com\/\+\/web\/snippet\/',
      'Devil',
      'Digg',
      'Digincore',
      'DigitalPebble',
      'Dirbuster',
      'Dispatch\/',
      'DittoSpyder',
      'dlvr',
      'DMBrowser',
      'DNS-Tools Header-Analyzer',
      'DNSPod-reporting',
      'docoloc',
      'Dolphin http client\/',
      'DomainAppender',
      'Donuts Content Explorer',
      'dotMailer content retrieval',
      'dotSemantic',
      'downforeveryoneorjustme',
      'Download\ Wonder',
      'downnotifier\.com',
      'DowntimeDetector',
      'Dragonfly File Reader',
      'Drip',
      'drupact',
      'Drupal \(\+http:\/\/drupal\.org\/\)',
      'DTS\ Agent',
      'dubaiindex',
      'EARTHCOM',
      'Easy-Thumb',
      'EasyDL',
      'Ebingbong',
      'ec2linkfinder',
      'eCairn-Grabber',
      'eCatch',
      'ECCP',
      'echocrawl',
      'eContext\/',
      'Ecxi',
      'EirGrabber',
      'ElectricMonk',
      'elefent',
      'EMail Exractor',
      'Email%20Extractor%20Lite',
      'EMail\ Wolf',
      'EmailWolf',
      'Embed PHP Library',
      'Embedly',
      'europarchive\.org',
      'evc-batch',
      'EventMachine HttpClient',
      'Everwall Link Expander',
      'Evidon',
      'Evrinid',
      'ExactSearch',
      'ExaleadCloudview',
      'Excel\/',
      'Exif Viewer',
      'ExperianCrawlUK',
      'Exploratodo',
      'Express WebPictures',
      'ExtractorPro',
      'Extreme\ Picture\ Finder',
      'EyeNetIE',
      'ezooms',
      'facebookexternalhit',
      'facebookplatform',
      'fairshare',
      'Faraday v',
      'fasthttp',
      'Faveeo',
      'Favicon downloader',
      'FavOrg',
      'Feed Wrangler',
      'Feedbin',
      'FeedBooster',
      'FeedBucket',
      'FeedBunch\/[0-9]',
      'FeedBurner',
      'FeedChecker',
      'Feedly',
      'Feedspot',
      'Feedwind\/[0-9]',
      'feeltiptop',
      'Fetch API',
      'Fetch\/[0-9]',
      'Fever\/[0-9]',
      'FHscan',
      'Fimap',
      'findlink',
      'findthatfile',
      'FlashGet',
      'FlipboardBrowserProxy',
      'FlipboardProxy',
      'FlipboardRSS',
      'Flock\/',
      'fluffy',
      'Flunky',
      'flynxapp',
      'forensiq',
      'FoundSeoTool\/[0-9]',
      'free thumbnails',
      'Freeuploader',
      'FreeWebMonitoring SiteChecker',
      'Funnelback',
      'G-i-g-a-b-o-t',
      'g00g1e\.net',
      'GAChecker',
      'ganarvisitas\/[0-9]',
      'geek-tools',
      'Genderanalyzer',
      'Genieo',
      'GentleSource',
      'Getintent',
      'GetLinkInfo',
      'getprismatic\.com',
      'GetRight',
      'GetURLInfo\/[0-9]',
      'GetWeb',
      'Ghost Inspector',
      'GigablastOpenSource',
      'GIS-LABS',
      'github-camo',
      'github\.com\/',
      'Go [\d\.]* package http',
      'Go http package',
      'Go!Zilla',
      'Go-Ahead-Got-It',
      'Go-http-client',
      'gobyus',
      'gofetch',
      'GomezAgent',
      'gooblog',
      'Goodzer\/[0-9]',
      'GoogleCloudMonitoring',
      'Google favicon',
      'Google Keyword Suggestion',
      'Google Keyword Tool',
      'Google Page Speed Insights',
      'Google PP Default',
      'Google Search Console',
      'Google Web Preview',
      'Google-Adwords',
      'Google-Apps-Script',
      'Google-Calendar-Importer',
      'Google-HotelAdsVerifier',
      'Google-HTTP-Java-Client',
      'Google-Publisher-Plugin',
      'Google-SearchByImage',
      'Google-Site-Verification',
      'Google-Structured-Data-Testing-Tool',
      'Google-Youtube-Links',
      'google_partner_monitoring',
      'GoogleDocs',
      'GoogleHC\/',
      'GoogleProducer',
      'Gookey',
      'GoScraper',
      'GoSpotCheck',
      'GoSquared-Status-Checker',
      'gosquared-thumbnailer',
      'Gotit',
      'GoZilla',
      'grabify',
      'GrabNet',
      'Grafula',
      'Grammarly',
      'GrapeFX',
      'grokkit',
      'grouphigh',
      'grub-client',
      'gSOAP\/',
      'GT::WWW',
      'GTmetrix',
      'GuzzleHttp',
      'gvfs\/',
      'HAA(A)?RTLAND http client',
      'Haansoft',
      'hackney\/',
      'Hatena',
      'Havij',
      'hawkReader',
      'HEADMasterSEO',
      'HeartRails_Capture',
      'help@dataminr\.com',
      'heritrix',
      'historious\/',
      'hledejLevne\.cz\/[0-9]',
      'Hloader',
      'HMView',
      'Holmes',
      'HonesoSearchEngine\/',
      'HootSuite Image proxy',
      'Hootsuite-WebFeed\/[0-9]',
      'hosterstats',
      'HostTracker',
      'ht:\/\/check',
      'htdig',
      'HTMLparser',
      'http-get',
      'HTTP-Header-Abfrage',
      'http-kit',
      'http-request\/',
      'HTTP-Tiny',
      'HTTP::Lite',
      'http\.rb\/',
      'HTTP_Compression_Test',
      'http_request2',
      'http_requester',
      'HttpComponents',
      'httphr',
      'HTTPMon',
      'httpscheck',
      'httpssites_power',
      'httpunit',
      'HttpUrlConnection',
      'httrack',
      'huaweisymantec',
      'HubPages.*crawlingpolicy',
      'HubSpot ',
      'Humanlinks',
      'HyperZbozi.cz Feeder',
      'i2kconnect\/',
      'Iblog',
      'ichiro',
      'Id-search',
      'IdeelaborPlagiaat',
      'IDG Twitter Links Resolver',
      'IDwhois\/[0-9]',
      'Iframely',
      'igdeSpyder',
      'IlTrovatore',
      'Image\ Fetch',
      'Image\ Sucker',
      'ImageEngine\/',
      'Imagga',
      'imgsizer',
      'InAGist',
      'inbound\.li parser',
      'InDesign%20CC',
      'Indy\ Library',
      'infegy',
      'infohelfer',
      'InfoTekies',
      'InfoWizards Reciprocal Link System PRO',
      'inpwrd\.com',
      'instabid',
      'Instapaper',
      'Integrity',
      'integromedb',
      'Intelliseek',
      'InterGET',
      'Internet\ Ninja',
      'internet_archive',
      'InternetSeer',
      'internetVista monitor',
      'intraVnews',
      'IODC',
      'IOI',
      'iplabel',
      'ips-agent',
      'IPS\/[0-9]',
      'IPWorks HTTP\/S Component',
      'iqdb\/',
      'Iria',
      'Irokez',
      'isitup\.org',
      'iskanie',
      'iZSearch',
      'janforman',
      'Jaunt\/',
      'Jbrofuzz',
      'Jersey\/',
      'JetCar',
      'Jigsaw',
      'Jobboerse',
      'JobFeed discovery',
      'Jobg8 URL Monitor',
      'jobo',
      'Jobrapido',
      'Jobsearch1\.5',
      'JoinVision Generic',
      'JolokiaPwn',
      'Joomla',
      'Jorgee',
      'JS-Kit',
      'JustView',
      'Kaspersky Lab CFR link resolver',
      'KeepRight OpenStreetMap Checker',
      'Kelny\/',
      'Kerrigan\/',
      'KeyCDN',
      'Keyword Extractor',
      'Keyword\ Density',
      'Keywords Research',
      'KickFire',
      'KimonoLabs\/',
      'Kml-Google',
      'knows\.is',
      'KOCMOHABT',
      'kouio',
      'kube-probe',
      'kulturarw3',
      'KumKie',
      'L\.webis',
      'Larbin',
      'Lavf\/',
      'LayeredExtractor',
      'LeechFTP',
      'LeechGet',
      'letsencrypt',
      'Lftp',
      'LibVLC',
      'LibWeb',
      'Libwhisker',
      'libwww',
      'Licorne Image Snapshot',
      'Liferea\/',
      'Lightspeedsystems',
      'Likse',
      'link checker',
      'Link Valet',
      'link_thumbnailer',
      'LinkAlarm\/',
      'linkCheck',
      'linkdex',
      'LinkExaminer',
      'linkfluence',
      'linkpeek',
      'LinkPreviewGenerator',
      'LinkScan',
      'LinksManager',
      'LinkTiger',
      'LinkWalker',
      'Lipperhey',
      'Litemage_walker',
      'livedoor ScreenShot',
      'LoadImpactRload',
      'LongURL API',
      'looksystems\.net',
      'ltx71',
      'lua-resty-http',
      'lwp-request',
      'lwp-trivial',
      'LWP::Simple',
      'lycos',
      'LYT\.SR',
      'mabontland',
      'Mag-Net',
      'MagpieRSS',
      'Mail.Ru',
      'MailChimp',
      'Majestic12',
      'makecontact\/',
      'Mandrill',
      'MapperCmd',
      'marketinggrader',
      'MarkMonitor',
      'MarkWatch',
      'Mass\ Downloader',
      'masscan\/[0-9]',
      'Mata\ Hari',
      'Mediapartners-Google',
      'mediawords',
      'MegaIndex\.ru',
      'Melvil Rawi\/',
      'MergeFlow-PageReader',
      'Metaspinner',
      'MetaURI',
      'MFC_Tear_Sample',
      'Microsearch',
      'Microsoft Office ',
      'Microsoft Outlook',
      'Microsoft Windows Network Diagnostics',
      'Microsoft-WebDAV-MiniRedir',
      'Microsoft\ Data\ Access',
      'MIDown\ tool',
      'MIIxpc',
      'Mindjet',
      'Miniature.io\/',
      'Miniflux',
      'Mister\ PiX',
      'mixdata dot com',
      'mixed-content-scan',
      'mixnode',
      'Mnogosearch',
      'mogimogi',
      'Mojeek',
      'Mojolicious \(Perl\)',
      'monitis',
      'Monitority\/[0-9]',
      'montastic',
      'MonTools',
      'Moreover',
      'Morfeus\ Fucking\ Scanner',
      'Morning Paper',
      'MovableType',
      'mowser',
      'Mrcgiguy',
      'MS\ Web\ Services\ Client\ Protocol',
      'MSFrontPage',
      'mShots',
      'MuckRack\/',
      'muhstik-scan',
      'MVAClient',
      'MxToolbox\/',
      'nagios',
      'Najdi\.si\/',
      'Name\ Intelligence',
      'Nameprotect',
      'Navroad',
      'NearSite',
      'Needle',
      'Nessus',
      'Net\ Vampire',
      'NetAnts',
      'NETCRAFT',
      'NetLyzer',
      'NetMechanic',
      'Netpursual',
      'netresearch',
      'NetShelter ContentScan',
      'Netsparker',
      'NetTrack',
      'Netvibes',
      'NetZIP',
      'Neustar WPM',
      'NeutrinoAPI',
      'NewRelicPinger\/1.0 \(\d+\)',
      'NewsBlur .*Finder',
      'NewsGator',
      'newsme',
      'newspaper\/',
      'Nexgate Ruby Client',
      'NG-Search',
      'Nibbler',
      'NICErsPRO',
      'Nikto',
      'nineconnections\.com',
      'NLNZ_IAHarvester',
      'Nmap Scripting Engine',
      'node-superagent',
      'node-urllib\/',
      'node\.io',
      'nominet\.org\.uk',
      'Norton-Safeweb',
      'Notifixious',
      'notifyninja',
      'nuhk',
      'nutch',
      'Nuzzel',
      'nWormFeedFinder',
      'Nymesis',
      'NYU',
      'Ocelli\/[0-9]',
      'Octopus',
      'oegp',
      'Offline Explorer',
      'Offline\ Navigator',
      'okhttp',
      'Omea Reader',
      'omgili',
      'OMSC',
      'Online Domain Tools',
      'OpenCalaisSemanticProxy',
      'Openfind',
      'OpenLinkProfiler',
      'Openstat\/',
      'OpenVAS',
      'Optimizer',
      'Orbiter',
      'OrgProbe\/[0-9]',
      'orion-semantics',
      'Outlook-Express',
      'ow\.ly',
      'Owler',
      'ownCloud News',
      'OxfordCloudService\/[0-9]',
      'Page Analyzer',
      'Page Valet',
      'page2rss',
      'page\ scorer',
      'page_verifier',
      'PageAnalyzer',
      'PageGrabber',
      'PagePeeker',
      'PageScorer',
      'Pagespeed\/[0-9]',
      'Panopta',
      'panscient',
      'Papa\ Foto',
      'parsijoo',
      'Pavuk',
      'PayPal IPN',
      'pcBrowser',
      'Pcore-HTTP',
      'PEAR HTTPRequest',
      'Pearltrees',
      'PECL::HTTP',
      'peerindex',
      'Peew',
      'PeoplePal',
      'Perlu -',
      'PhantomJS Screenshoter',
      'PhantomJS\/',
      'Photon\/',
      'phpcrawl',
      'phpservermon',
      'Pi-Monster',
      'Picscout',
      'Picsearch',
      'PictureFinder',
      'Pimonster',
      'ping\.blo\.gs\/',
      'Pingability',
      'Pingdom',
      'Pingoscope',
      'PingSpot',
      'pinterest\.com',
      'Pixray',
      'Pizilla',
      'PleaseCrawl',
      'Ploetz \+ Zeller',
      'Plukkie',
      'plumanalytics',
      'PocketParser',
      'Pockey',
      'POE-Component-Client-HTTP',
      'Pompos',
      'Porkbun',
      'Port Monitor',
      'postano',
      'PostmanRuntime\/',
      'PostPost',
      'postrank',
      'PowerPoint\/',
      'Priceonomics Analysis Engine',
      'PrintFriendly\.com',
      'PritTorrent\/[0-9]',
      'Prlog',
      'probethenet',
      'Project 25499',
      'Promotion_Tools_www.searchenginepromotionhelp.com',
      'prospectb2b',
      'Protopage',
      'ProWebWalker',
      'proximic',
      'PRTG Network Monitor',
      'pshtt, https scanning',
      'PTST ',
      'PTST\/[0-9]+',
      'Pulsepoint XT3 web scraper',
      'Pump',
      'Python-httplib2',
      'python-requests',
      'Python-urllib',
      'Qirina Hurdler',
      'QQDownload',
      'QrafterPro',
      'Qseero',
      'Qualidator.com SiteAnalyzer',
      'QueryN\ Metasearch',
      'Quora Link Preview',
      'Qwantify',
      'Radian6',
      'RankActive',
      'RankFlex',
      'RankSonicSiteAuditor',
      'Readability',
      'RealDownload',
      'RealPlayer%20Downloader',
      'RebelMouse',
      'Recorder',
      'RecurPost\/',
      'redback\/',
      'Redirect Checker Tool',
      'ReederForMac',
      'ReGet',
      'RepoMonkey',
      'request\.js',
      'ResponseCodeTest\/[0-9]',
      'RestSharp',
      'Riddler',
      'Rival IQ',
      'Robosourcer',
      'Robozilla\/[0-9]',
      'ROI Hunter',
      'RPT-HTTPClient',
      'RSSOwl',
      'safe-agent-scanner',
      'SalesIntelligent',
      'Saleslift',
      'SauceNAO',
      'SBIder',
      'scalaj-http',
      'scan\.lol',
      'ScanAlert',
      'Scoop',
      'scooter',
      'ScoutJet',
      'ScoutURLMonitor',
      'Scrapy',
      'Screaming',
      'ScreenShotService\/[0-9]',
      'Scrubby',
      'Search37\/',
      'search\.thunderstone',
      'Searchestate',
      'SearchSight',
      'Seeker',
      'semanticdiscovery',
      'semanticjuice',
      'Semiocast HTTP client',
      'Semrush',
      'sentry\/',
      'SEO Browser',
      'Seo Servis',
      'seo-nastroj.cz',
      'Seobility',
      'SEOCentro',
      'SeoCheck',
      'SEOkicks',
      'Seomoz',
      'SEOprofiler',
      'SeopultContentAnalyzer',
      'seoscanners',
      'SEOstats',
      'Server Density Service Monitoring',
      'servernfo\.com',
      'SetCronJob\/',
      'sexsearcher',
      'Seznam',
      'Shelob',
      'Shodan',
      'Shoppimon Analyzer',
      'ShoppimonAgent\/[0-9]',
      'ShopWiki',
      'ShortLinkTranslate',
      'shrinktheweb',
      'Sideqik',
      'SilverReader',
      'SimplePie',
      'SimplyFast',
      'Siphon',
      'SISTRIX',
      'Site-Shot\/',
      'Site24x7',
      'Site\ Sucker',
      'SiteBar',
      'Sitebeam',
      'Sitebulb\/',
      'SiteCondor',
      'SiteExplorer',
      'SiteGuardian',
      'Siteimprove',
      'SiteIndexed',
      'Sitemap(s)? Generator',
      'SiteMonitor',
      'Siteshooter B0t',
      'SiteSnagger',
      'SiteSucker',
      'SiteTruth',
      'Sitevigil',
      'sitexy\.com',
      'SkypeUriPreview',
      'Slack\/',
      'slider\.com',
      'slurp',
      'SlySearch',
      'SmartDownload',
      'SMRF URL Expander',
      'SMUrlExpander',
      'Snake',
      'Snappy',
      'SniffRSS',
      'sniptracker',
      'Snoopy',
      'SnowHaze Search',
      'sogou web',
      'SortSite',
      'Sottopop',
      'sovereign\.ai',
      'SpaceBison',
      'Spammen',
      'Spanner',
      'spaziodati',
      'SPDYCheck',
      'Specificfeeds',
      'speedy',
      'SPEng',
      'Spinn3r',
      'spray-can',
      'Sprinklr ',
      'spyonweb',
      'sqlmap',
      'Sqlworm',
      'Sqworm',
      'SSL Labs',
      'ssl-tools',
      'StackRambler',
      'Statastico\/',
      'StatusCake',
      'Steeler',
      'Stratagems Kumo',
      'Stroke.cz',
      'StudioFACA',
      'suchen',
      'Sucuri',
      'summify',
      'Super Monitoring',
      'SuperHTTP',
      'Surphace Scout',
      'Suzuran',
      'SwiteScraper',
      'Symfony BrowserKit',
      'Symfony2 BrowserKit',
      'SynHttpClient-Built',
      'Sysomos',
      'sysscan',
      'Szukacz',
      'T0PHackTeam',
      'tAkeOut',
      'Tarantula\/',
      'Taringa UGC',
      'Teleport',
      'Telesoft',
      'Telesphoreo',
      'Telesphorep',
      'Tenon\.io',
      'teoma',
      'terrainformatica\.com',
      'Test Certificate Info',
      'Tetrahedron\/[0-9]',
      'The Drop Reaper',
      'The Expert HTML Source Viewer',
      'The Knowledge AI',
      'The\ Intraformant',
      'theinternetrules',
      'TheNomad',
      'theoldreader\.com',
      'Thinklab',
      'Thumbshots',
      'ThumbSniper',
      'TinEye',
      'Tiny Tiny RSS',
      'TLSProbe\/',
      'Toata',
      'topster',
      'touche.com',
      'Traackr.com',
      'TrapitAgent',
      'Trendiction',
      'Trendsmap Resolver',
      'trendspottr\.com',
      'truwoGPS',
      'TulipChain',
      'Turingos',
      'Turnitin',
      'tweetedtimes\.com',
      'Tweetminster',
      'Tweezler\/',
      'twibble',
      'Twice',
      'Twikle',
      'Twingly',
      'Twisted PageGetter',
      'Typhoeus',
      'ubermetrics-technologies',
      'uclassify',
      'uCrawlr\/',
      'UdmSearch',
      'UniversalFeedParser',
      'Unshorten\.It\!\/[0-9]',
      'Untiny',
      'UnwindFetchor',
      'updated',
      'updown\.io daemon',
      'Upflow',
      'Uptimia',
      'URL Verifier',
      'URLChecker',
      'URLitor.com',
      'urlresolver',
      'Urlstat',
      'UrlTrends Ranking Updater',
      'URLy\ Warning',
      'URLy\.Warning',
      'Vacuum',
      'Vagabondo',
      'VB\ Project',
      'vBSEO',
      'VCI',
      'via ggpht\.com GoogleImageProxy',
      'VidibleScraper',
      'Virusdie',
      'visionutils',
      'vkShare',
      'VoidEYE',
      'Voil',
      'voltron',
      'voyager\/',
      'VSAgent\/[0-9]',
      'VSB-TUO\/[0-9]',
      'Vulnbusters Meter',
      'VYU2',
      'w3af\.org',
      'W3C-checklink',
      'W3C-mobileOK',
      'W3C_I18n-Checker',
      'W3C_Unicorn',
      'Wallpapers\/[0-9]+',
      'WallpapersHD',
      'wangling',
      'Wappalyzer',
      'WatchMouse',
      'WbSrch\/',
      'web-capture\.net',
      'Web-Monitoring',
      'Web-sniffer',
      'Web\ Auto',
      'Web\ Collage',
      'Web\ Enhancer',
      'Web\ Fetch',
      'Web\ Fuck',
      'Web\ Pix',
      'Web\ Sauger',
      'Web\ Sucker',
      'Webalta',
      'Webauskunft',
      'WebAuto',
      'WebCapture',
      'WebClient\/',
      'webcollage',
      'WebCookies',
      'WebCopier',
      'WebCorp',
      'WebDoc',
      'WebEnhancer',
      'WebFetch',
      'WebFuck',
      'WebGo\ IS',
      'WebImageCollector',
      'WebImages',
      'WebIndex',
      'webkit2png',
      'WebLeacher',
      'webmastercoffee',
      'webmon ',
      'WebPix',
      'WebReaper',
      'WebSauger',
      'webscreenie',
      'Webshag',
      'Webshot',
      'Website Analyzer\/',
      'Website\ Quester',
      'WebsiteExtractor',
      'websitepulse agent',
      'websitepulse[+ ]checker',
      'WebsiteQuester',
      'Websnapr\/',
      'Webster',
      'WebStripper',
      'WebSucker',
      'Webthumb\/[0-9]',
      'WebThumbnail',
      'WebWhacker',
      'WebZIP',
      'WeCrawlForThePeace',
      'WeLikeLinks',
      'WEPA',
      'WeSEE',
      'wf84',
      'Wfuzz\/',
      'wget',
      'WhatsApp',
      'WhatsMyIP',
      'WhatWeb',
      'WhereGoes\?',
      'Whibse',
      'WhoRunsCoinHive',
      'Whynder Magnet',
      'Windows-RSS-Platform',
      'WinHttpRequest',
      'wkhtmlto',
      'wmtips',
      'Woko',
      'Word\/',
      'WordPress\/',
      'wotbox',
      'WP Engine Install Performance API',
      'wpif',
      'wprecon\.com survey',
      'WPScan',
      'wscheck',
      'Wtrace',
      'WWW-Collector-E',
      'WWW-Mechanize',
      'WWW::Mechanize',
      'www\.monitor\.us',
      'WWWOFFLE',
      'x09Mozilla',
      'x22Mozilla',
      'XaxisSemanticsClassifier',
      'Xenu Link Sleuth',
      'XING-contenttabreceiver\/[0-9]',
      'XmlSitemapGenerator',
      'xpymep([0-9]?)\.exe',
      'Y!J-(ASR|BSC)',
      'Yaanb',
      'yacy',
      'Yahoo Ad monitoring',
      'Yahoo Link Preview',
      'YahooCacheSystem',
      'YahooYSMcm',
      'YandeG',
      'Yandex(?!Search)',
      'yanga',
      'yeti',
      'Yo-yo',
      'Yoleo Consumer',
      'yoogliFetchAgent',
      'YottaaMonitor',
      'Your-Website-Sucks\/[0-9]',
      'yourls\.org',
      'Zade',
      'Zao',
      'Zauba',
      'Zemanta Aggregator',
      'Zend\\Http\\Client',
      'Zend_Http_Client',
      'Zermelo',
      'Zeus',
      'zgrab',
      'ZnajdzFoto',
      'Zombie\.js',
      'ZyBorg',
      'SpamExperts',
      '[a-z0-9\-_]*(bot|crawler|crawl|archiver|spider|mediapartners|slurp|patrol|transcoder|spider|uptime|validator|fetcher)'      
   );
   if(is_array($crawlers_agents)) { 
      foreach($crawlers_agents as $crawler) { 
         if (strpos(strtolower($_SERVER['HTTP_USER_AGENT']),trim($crawler)) !== false) { 
            return true; 
         } 
      } 
   }
   if (strpos($_SERVER['HTTP_USER_AGENT'], 'Headless') !== false) {
      return 'true';
   }  
   return false; 
}