How to ban ip access in php

php method to implement prohibition of ip access: first obtain the client ip, and split the ip parameters into arrays; then record whether there is a successful match in the loop detection, if it is a [*] symbol replacement, it will not be checked and terminated Check this ip.

php method to ban ip access:

//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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