PHP method to restrict IP access_php tips

This article mainly introduces the method of restricting IP access in PHP, involving PHP's related operation skills such as obtaining, parsing, traversing, and judging client IPs. Friends in need can refer to the examples of this article

Describes the method of restricting IP access in PHP. Share it with everyone for your reference, the details are as follows:

//获取客户端ip
if (getenv("HTTP_CLIENT_IP"))
  $ip = getenv("HTTP_CLIENT_IP"); 
else if(getenv("HTTP_X_FORWARDED_FOR"))
  $ip = getenv("HTTP_X_FORWARDED_FOR");
else if(getenv("REMOTE_ADDR"))
  $ip = getenv("REMOTE_ADDR");
else $ip = "Unknow";
$ALLOWED_IP=array('10.144.39.132');
//允许访问的ip
$check_ip_arr= explode('.',$ip);
//ip参数拆分成数组
if(!in_array($ip,$ALLOWED_IP)) {
  $bl=false;
  foreach ($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]!=&#39;*&#39;){
          //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则终止匹配
        break;
      }
    }
  }
  //end foreach
  if(!$bl){
    $return=array(
       &#39;status&#39;=>2,
       &#39;msg&#39;=>&#39;该IP无权限访问&#39;,
       &#39;data&#39;=>$ip
       );
    echo json_encode($return);
    exit();
  }
}

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