对IP及IP段进行访问限制

本来是写了几个函数，IP黑名单是记到库里的，为了方便理解，改成了一个class把IP黑名单写了出来。

192.168.1.1 单个IP
192.168.1.*      这样代理   192.168.1.1-192.168.1-255
192.158.1.2-20 这样是代表192.158.1.2-192.158.1.20
也可以这样写  192.168.1.[1|2|3]

嘿嘿～一个方法不知道想法是否周全，拿出来大家讨论

使用

以下是引用片段：
$oBlock_ip = new block_ip();
$oBlock_ip->checkIP();

以下是引用片段：
class block_ip {
       var $Block_ip = array("192.168.1.1","210.10.2.1-20","222.34.4.*");
       
       function __construct(){
              
       }
       
       function __destruct(){
              
       }
       
       private function makePregIP($str){
              if (strstr($str,"-")) {
                     $aIP = explode(".",$str);
                     foreach ($aIP as $k=>$v) {
                            if (!strstr($v,"-")) {
                                   $preg_limit .= makePregIP($v);
                            }       else{
                                   $aipNum = explode("-",$v);
                                   for($i=$aipNum[0];$i                                          $preg .=$preg?"|".$i:"[".$i;
                                   }
                                   $preg_limit .=strrpos($preg_limit,".",1)==(strlen($preg_limit)-1)?$preg."]":".".$preg."]";
                            }
                     }
              }else{
                     $preg_limit .= $str.".";
              }
              return $preg_limit;
       }

       private function getAllBlockIP(){
              if ($this->Block_ip) {
                     foreach ($this->Block_ip as $k=>$v) {
                            $ipaddres = $this->makePregIP($v->start_ip);
                            $ip = str_ireplace(".","\.",$ipaddres);
                            $ip  = str_replace("*","[0-9]{1,3}",$ip);
                            $ipaddres  = "/".$ip."/";
                            $ip_list[] = $ipaddres;
                     }
              }
              return $ip_list;
       }

       public function checkIP() {
              $iptable = $this->getAllBlockIP();
              $IsJoined = true;
              //取得用户ip
              $Ip = $this->get_client_ip();
              $Ip = trim($Ip);
              //剔除黑名单中的IP区段
              if ($iptable) {
                     foreach($iptable as $value) {
                            if (preg_match("{$value}",$Ip)) {
                                   $IsJoined = false;
                                   break;
                            }
                     }
              }
              //如果在ip黑名单中就执行如下操作
              if( !$IsJoined ){
                     echo "IP Error";
                     exit;
              }
       }

       private function get_client_ip(){
              if (getenv("HTTP_CLIENT_IP") && strcasecmp(getenv("HTTP_CLIENT_IP"), "unknown"))
              $ip = getenv("HTTP_CLIENT_IP");
              else if (getenv("HTTP_X_FORWARDED_FOR") && strcasecmp(getenv("HTTP_X_FORWARDED_FOR"), "unknown"))
              $ip = getenv("HTTP_X_FORWARDED_FOR");
              else if (getenv("REMOTE_ADDR") && strcasecmp(getenv("REMOTE_ADDR"), "unknown"))
              $ip = getenv("REMOTE_ADDR");
              else if (isset($_SERVER[’REMOTE_ADDR’]) && $_SERVER[’REMOTE_ADDR’] && strcasecmp($_SERVER[’REMOTE_ADDR’], "unknown"))
              $ip = $_SERVER[’REMOTE_ADDR’];
              else
              $ip = "unknown";
              return($ip);
       }

}
?>