ip2long
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.
long2ip
(PHP 4, PHP 5)
long2ip — (IPv4) インターネットアドレスをインターネット標準ドット表記に変換する
説明
string long2ip
( int $proper_address
)
関数long2ip() は、適切なアドレス表現からドット表記 (例:aaa.bbb.ccc.ddd)のインターネットアドレスを生成します。
パラメータ
- proper_address
-
正しい形式のアドレス。
返り値
インターネットの IP アドレスを表す文字列を返します。
add a note
User Contributed Noteslong2ip
php dot net at davidstockton dot com
04-Sep-2008 07:28
04-Sep-2008 07:28
Gabriel Malca
17-Mar-2006 02:01
17-Mar-2006 02:01
If the function doesn't exist:
<?
if (!function_exists("long2ip")) {
function long2ip($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 06:51
28-Jan-2006 06:51
Random ip address! (4294967295 is 255.255.255.255)
long2ip(rand(0, "4294967295"))
flobee
13-Feb-2005 11:50
13-Feb-2005 11:50
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 10:13
16-Feb-2003 10:13
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