function getIP(){

      return isset($_SERVER['HTTP_X_FORWARDED_FOR'])?

      $_SERVER['HTTP_X_FORWARDED_FOR']:

      (isset($_SERVER['HTTP_CLIENT_IP'])?

      $_SERVER['HTTP_CLIENT_IP']:$_   SERVER['REMOTE_ADDR']);

 }

 function check_ip(){

     $ALLOWED_IP=array('112.91.81.82','221.4.223.112','221.4.223.107','192.168.*.*','127.0.0.1');

     $IP=getIP();

     $check_ip_arr= explode('.',$IP);//要检测的ip拆分成数组

     #限制IP

     if(!in_array($IP,$ALLOWED_IP)) {

         foreach ($ALLOWED_IP as $val){

             if(strpos($val,'*')!==false){//发现有*号替代符

                  $arr=array();//

                  $arr=explode('.', $val);

                  $bl=true;//用于记录循环检测中是否有匹配成功的

                  for($i=0;$i<4;$i++){

                     if($arr[$i]!='*'){//不等于*  就要进来检测，如果为*符号替代符就不检查

                         if($arr[$i]!=$check_ip_arr[$i]){

                             $bl=false;

                             break;//终止检查本个ip 继续检查下一个ip

                         }

                     }

                  }//end for

                  if($bl){//如果是true则找到有一个匹配成功的就返回

                     return;

                     die;

                  }

             }

         }//end foreach

         header('HTTP/1.1 403 Forbidden');

         echo "Access forbidden";

         die;

     }

 }  

 $host='221.2.56.125';

 $db_user='user';

 $db_pass='pwd';

 $db_name='table';

 $link=mysql_connect($host,$db_user,$db_pass) or die("can not connect database");

 mysql_select_db($db_name,$link);

 //mysql_query("SET names UTF8");

 //header("Content-Type:text/html;charset=utf-8");