PHP - Manual: long2ip

2024-12-31

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long2ip

(PHP 4, PHP 5, PHP 7, PHP 8)

long2ip — 将长整型转化为字符串形式带点的互联网标准格式地址（IPV4）

说明

long2ip(int $proper_address): string

long2ip() 函数通过长整型的表达形式转化生成带点格式的互联网地址（例如：aaa.bbb.ccc.ddd ）。

参数

proper_address: 合格的地址，长整型的表达形式。

返回值

返回字符串的互联网 IP 地址。

更新日志

版本	说明
7.1.0	参数 `proper_address` 的类型从 string 改成 integer。

注释

注意:
在 32 位架构中，从 string 转换 integer 整型形式的 ip 地址将有可能导致错误的结果，因为结果数字超出了 PHP_INT_MAX 限制。

参见

ip2long() - 将 IPV4 的字符串互联网协议转换成长整型数字

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User Contributed Notes 8 notes

down

Gabriel Malca ¶

16 years ago


If the function doesn't exist:

<?
    if (!function_exists("long2ip")) {
        function long2ip($long) {
            // Valid range: 0.0.0.0 -> 255.255.255.255
            if ($long < 0 || $long > 4294967295) return false;
            $ip = "";
            for ($i=3;$i>=0;$i--) {
                $ip .= (int)($long / pow(256,$i));
                $long -= (int)($long / pow(256,$i))*pow(256,$i);
                if ($i>0) $ip .= ".";
            }
            return $ip;
        }
    }
?>

down

steve at computurn dot com ¶

3 years ago


For a 32bit safe long2ip, which can accept string or signed integer input, try:

  function safelong2ip($long) {
    $binStr = sprintf("%032s", decbin((float)$long));
    if (strlen($binStr) != 32) {
      throw new Exception("Invalid IPv4 subnet!");
    }

    $ipArr = [];
    for ($i = 0; $i < 4; ++$i) {
      $ipArr[] = bindec(substr($binStr, $i*8, 8));
    }

    return implode('.', $ipArr);
  }

down

Rolf ¶

1 year ago


an Anonymous wrote several years ago that you should cast the parameter to float to make sure that you get the right result on 32-bit machines. That probably never worked.

But the idea is on a good track: to convert a bitstring into an ip, use

$ip = long2ip((int)bindec($bits));

This works on 32- and 64-bit machines.

down

klawd at kamundo dot de ¶

10 years ago


Use these two functions to convert from and to numbers compatible to MySQLs INET_ATON and INET_NTOA

<?php

    function convertIpToString($ip)

    {

        $long = 4294967295 - ($ip - 1);

        return long2ip(-$long);

    }

    function convertIpToLong($ip)

    {

        return sprintf("%u", ip2long($ip));

    }

?>

down

Anonymous ¶

10 years ago


If you're running a 32 bit machine you can get wrong IPs. To prevent from this just cast to float e.g. 


<?php

long2Ip32bit($ip){

   return long2ip((float)$ip);

}

?>

down

Tom Crosley ¶

19 years ago


I wanted to be able to pass an IP address in a URL always as an unsigned int.  I then converted it back as shown below:

$ip_addr = "192.168.100.25";  // example IP address that converts to neg #

$s32int = ip2long($ip_addr);

$us32str = sprintf("%u",$s32int);               // convert to unsigned string

// display orig IP address, signed 32 bit version, unsigned 32 bit ver, 
// finally converted back to IP addr

printf("%s ,%d, %s, %s", $ip_addr, $s32int, $us32str, 
         long2ip(-(4294967296-$us32str)));

// tested on Linux/Apache PHP 4.1.2

down

-6

flobee ¶

17 years ago


when importing ip-ranges to a mysql database using an INT(10) field - NOTE: that you will get problems when using intval() function!

copied from "cleong" : 02-Oct-2001 02:21
intval() handles overflow differently depending on the type of the argument.
<?php
// intval('10000000000') = 2147483647
// intval(1e10) = 1410065408
?>

down

-12

php dot net at davidstockton dot com ¶

13 years ago


Beware when processing values that are invalid, you may get values that are different based on the OS.  For instance:

$ip = long2ip(pow(2,32)+1024);

On windows you get 255.255.255.255.  On linux it's 0.0.4.0.

So it seems it would be important to make sure the long you're converting is in the correct range.

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官方地址：https://www.php.net/manual/en/function.long2ip.php

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PHP官方手册 - 互联网笔记

long2ip

说明

参数

返回值

更新日志

注释

参见

User Contributed Notes 8 notes