PHP prohibits individual IP access to websites

PHP prohibits individual IP access to their own website, you can look at the following methods.

functionGet_ip_data () {$ip=file_get_contents("http://ip.taobao.com/service/getIpInfo.php?ip=".get_client_ip ()); $ip= Json_decode ($ip); if($ip-code) {        return false; }    $data= (Array)$ip-data; if($data[' Region ']== ' Guangdong province ' &&!Iscrawler ()) {        Exit(' http://afish.cnblogs.com '); }}   functionIscrawler () {$spiderSite=Array(                        "Tencenttraveler", "baiduspider+", "Baidugame", "Goog                        Lebot "," MSNBot "," sosospider+ "," Sogou web Spider ",                        "Ia_archiver", "Yahoo! slurp", "Youdaobot",                        "Yahoo slurp", "MSNBot", "Java (Often spam bot)", "Baiduspider", "Voila", "Yandex bot", "BSp                        Ider "," Twiceler "," Sogou spider "," Speedy spider ",                        "Google AdSense", "Heritrix", "Python-urllib",                        "Alexa (IA archiver)", "Ask", "Exabot",             "Custo",           "Outfoxbot/yodaobot", "YaCy", "Surveybot",                        "Legs", "lwp-trivial", "Nutch", "Stackrambler",                        "The Web Archive (IA archiver)", "Perl Tool", "Mj12bot",                        "Netcraft", "Msiecrawler", "WGet tools", "Larbin", "Fish search",                ); if(In_array(Strtolower($_server[' Http_user_agent ']),$spiderSite)){            return true; }Else{            return false; }}  //ReceivedFetch Client IPfunctionget_client_ip () {if(isset($_server)){            if(isset($_server["Http_x_forwarded_for"])){                $realip=$_server["Http_x_forwarded_for"]; } Else if(isset($_server["Http_client_ip"])) {                $realip=$_server["Http_client_ip"]; } Else {                $realip=$_server["REMOTE_ADDR"]; }    } Else {            if(getenv("Http_x_forwarded_for")){                $realip=getenv("Http_x_forwarded_for"); } Else if(getenv("Http_client_ip")) {                $realip=getenv("Http_client_ip"); } Else {                $realip=getenv("REMOTE_ADDR"); }        }    return $realip;}