Network 函数
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long2ip

(PHP 4, PHP 5)

long2ip — Converts an (IPv4) Internet network address into a string in Internet standard dotted format

说明

string long2ip ( string $proper_address )

The function long2ip() generates an Internet address in dotted format (i.e.: aaa.bbb.ccc.ddd) from the proper address representation.

参数

proper_address

A proper address representation.

返回值

Returns the Internet IP address as a string.

参见

Network 函数
在线手册：中文 英文
PHP手册
PHP手册 - N: Converts an (IPv4) Internet network address into a string in Internet standard dotted format

用户评论:

klawd at kamundo dot de (25-Jan-2012 06:34)

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));
    }

Anonymous (05-Aug-2011 05:38)

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);
}
?>

php dot net at davidstockton dot com (04-Sep-2008 06:28)

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.

Gabriel Malca (17-Mar-2006 01:01)

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;
        }
    }
?>

randomize at randomizer dot com (28-Jan-2006 05:51)

Random ip address! (4294967295 is 255.255.255.255)

long2ip(rand(0, "4294967295"))

flobee (13-Feb-2005 10:50)

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
?>

Tom Crosley (16-Feb-2003 09:13)

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