PHP calculates all the IP in the network segment, assigns sub-network segments

Due to recent business needs, a function to get all the IP in the network segment is written, as well as a function to allocate the available subnet segments

/** * Calculate all IP * @param string $segment network segment ' 139.217.0.1/24 ' * @return array IP list [' 139.217.0.1 ', ' 139.217.0.2 ' ...] According to the network segment. */functionGetipbysegment ($segment){    $segmentInfo=Explode("/",$segment);//[' 139.217.0.1 ', []    $beginIpArray=Explode(".",$segmentInfo[0]);//[139,217,0,1]    $mask=intval($segmentInfo[' 1 ']);// -    $endIp=Array(); foreach($beginIpArray  as $ipKey=$item) {        $beginFlag= 8 * ($ipKey);//0 8        $endFlag= 8 * ($ipKey+ 1);//8        $decbinItem=Str_pad(Decbin($item), 8, "0",str_pad_left); $endIp[] =$mask>=$endFlag?$item: ($mask>$beginFlag?Bindec(Str_pad(substr($decbinItem, 0,$mask-$beginFlag), 8, "1", Str_pad_right)): ($ipKey<= 2?POW(2, 8)-1:POW(2, 8)-1)); }    $ipArray=Array();  for($beginIp[0] =$beginIpArray[0];$beginIp[0] <=$endIp[0];$beginIp[0]++) {         for($beginIp[1] =$beginIpArray[1];$beginIp[1] <=$endIp[1];$beginIp[1]++) {             for($beginIp[2] =$beginIpArray[2];$beginIp[2] <=$endIp[2];$beginIp[2]++) {                 for($beginIp[3] =$beginIpArray[3];$beginIp[3] <=$endIp[3];$beginIp[3]++) {                    $ipArray[] =implode(".",$beginIp); }            }        }    }    return $ipArray;}

/** * Assign subnet segment in specified network segment * @param string $segment Specify network segment * @param int $ipNum IP required * @param array $usedIpArray unavailable (already used) IP, default is empty Array * @return bool|string successful Returns the allocated network segment*/functionAllocatesegment ($segment,$ipNum,$usedIpArray= []){    $usedIpArray=Empty($usedIpArray) ? [] :Array_flip($usedIpArray); //calculate how many IPs are required    $i= 0; $ipCount=POW(2,$i);  while($ipCount<$ipNum) {        $i++; $ipCount=POW(2,$i); }    $newMask= 32-$i; //start and end IP for large network segments    $segmentInfo=Explode("/",$segment);//[' 139.217.0.1 ', []    $beginIpArray=Explode(".",$segmentInfo[0]);//[139,217,0,1]    $mask=intval($segmentInfo[' 1 ']);// -    if($newMask<$mask) {        return false; }    $endIp=Array(); $step= []; foreach($beginIpArray  as $ipKey=$item) {        $beginFlag= 8 * ($ipKey);//0 8        $endFlag= 8 * ($ipKey+ 1);//8        $step[$ipKey] =$newMask>$endFlag? 1: ($endFlag-$newMask< 8?POW(2,$endFlag-$newMask) :POW(2, 8)); $decbinItem=Str_pad(Decbin($item), 8, "0",str_pad_left); $endIp[] =$mask>=$endFlag?$item: ($mask>$beginFlag?Bindec(Str_pad(substr($decbinItem, 0,$mask-$beginFlag), 8, "1", Str_pad_right)): ($ipKey<= 2?POW(2, 8)-1:POW(2, 8)-1)); }    //Traverse the Build network segment     for($beginIp[0] =$beginIpArray[0];$beginIp[0] <=$endIp[0];$beginIp[0] + =$step[0]) {         for($beginIp[1] =$beginIpArray[1];$beginIp[1] <=$endIp[1];$beginIp[1] + =$step[1]) {             for($beginIp[2] =$beginIpArray[2];$beginIp[2] <=$endIp[2];$beginIp[2] + =$step[2]) {                 for($beginIp[3] =$beginIpArray[3];$beginIp[3] <=$endIp[3];$beginIp[3] + =$step[3]) {                    $newSegment=implode(‘.‘,$beginIp) . ‘/‘ .$newMask; //get all the IP of the network segment                    $ipArray= Getipbysegment ($newSegment); $canUse=true; //Determine if the network segment is available                    if(!Empty($usedIpArray)) {                        foreach($ipArray  as $ip) {                            if(isset($usedIpArray[$ip])) {                                $canUse=false;  Break; }                        }                    }                    if($canUse) {                        return $newSegment; }                }            }        }    }    return false;}

PHP calculates all the IP in the network segment, assigns sub-network segments