Merge IP Ranges with PHP

Question

I am stuck at a point and cant think beyond it :

I have a list of Ip ranges, I need to merge them making them as a range. For example

192.168.1.1

192.168.1.2

192.168.1.3

192.168.1.5

192.168.1.6

I need to club them into IP ranges. For this case it will be 192.168.1.1-192.168.1.3 and 192.168.1.5-192.168.1.6

I was thinking of converting these into integer by using ip2long function and sorting it. But can't think beyond that.

Any help would be appreciated.

Thanks In advance :)

Answer 1

you can use ip2long http://php.net/manual/en/function.ip2long.php that Converts a string containing an (IPv4) Internet Protocol dotted address into a proper address with this you can have a range like

echo ip2long('192.168.1.1');//-1062731519

echo ip2long('192.168.1.6');//-1062731514

with this you can check ip range of user ,... for valid or ,...

for example if user ip is in 192.168.1.1-192.168.1.6 range echo 'hello';

//http://www.php.net/manual/en/function.ip2long.php#81030
function in_ip_range($ip_one, $ip_two=false){ 
  if($ip_two===false){ 
    if($ip_one==$_SERVER['REMOTE_ADDR']){ 
        $ip=true; 
    }else{ 
        $ip=false; 
    } 
  }else{ 
    if(ip2long($ip_one)<=ip2long($_SERVER['REMOTE_ADDR']) && ip2long($ip_two)>=ip2long($_SERVER['REMOTE_ADDR'])){ 
        $ip=true; 
    }else{ 
        $ip=false; 
    } 
  } 
  return $ip; 
 } 
 //usage 
 if(in_ip_range('192.168.1.1','192.168.1.6')){
    echo 'hello';
 }

ip group

  $list=array(
   '192.168.1.1',
   '192.168.1.2',

   '192.168.1.3',

   '192.168.1.5',

   '192.168.1.6',
   '192.168.1.6',
   '192.168.1.9'
 );
 $Grouplist='';
 foreach($list as $ip){ 
       $ip2long=ip2long($ip);
       if(is_array($Grouplist)){
            $is_group=false;
            foreach($Grouplist as $Key=>$Range){
                 $Range=explode("/",$Range);
                 if(($Range[0]-1)<$ip2long and $ip2long<($Range[1]+1)){
                       $is_group=true;
                       continue;
                 }elseif(($Range[0]-1)==$ip2long){
                       $Grouplist[$Key]=$ip2long.'/'.$Range[1];
                       $is_group=true;
                 }elseif(($Range[1]+1)==$ip2long){
                      $Grouplist[$Key]=$Range[0].'/'.$ip2long;
                      $is_group=true;
                 }
            }
            if(!$is_group)
            {
                  $Grouplist[]=($ip2long).'/'.($ip2long);
            }
       }else{
             $Grouplist[]=($ip2long).'/'.($ip2long);
       }
 }
     print_r($Grouplist); 

output:

 Array
(
   [0] => -1062731519/-1062731517  
   [1] => -1062731515/-1062731514
   [2] => -1062731511/-1062731511
)

that if convert to ip group is

foreach($Grouplist as $Val){
     $Range=explode("/",$Val);
     echo long2ip($Range[0])."/".long2ip($Range[1])."\n";
}

output

192.168.1.1/192.168.1.3
192.168.1.5/192.168.1.6
192.168.1.9/192.168.1.9