long2ip

(PHP 4, PHP 5)

long2ip Converte un indirizzo di rete del Protocollo Internet (IPv4) in una stringa contenente un indirizzo espresso secondo la notazione standard di Internet.

Descrizione

string long2ip ( int $proper_address )

La funzione long2ip() genera un indirizzo Internet in formato separato da punti (es.: aaa.bbb.ccc.ddd) a partire dalla rappresentazione propria.

Vedere anche: ip2long()

add a note add a note

User Contributed Notes 6 notes

up
5
Anonymous
2 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);
}
?>
up
2
Tom Crosley
11 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
up
1
php dot net at davidstockton dot com
5 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.
up
0
flobee
9 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
?>
up
-1
klawd at kamundo dot de
2 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));
    }
?>
up
-2
Gabriel Malca
8 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;
        }
    }
?>
To Top