inet_ntop

(PHP 5 >= 5.1.0)

inet_ntop — Converts a packed internet address to a human readable representation

Description

string inet_ntop ( string $in_addr )

This function converts a 32bit IPv4, or 128bit IPv6 address (if PHP was built with IPv6 support enabled) into an address family appropriate string representation.

Parameters

in_addr: A 32bit IPv4, or 128bit IPv6 address.

Return Values

Returns a string representation of the address or FALSE on failure.

Examples

Example #1 inet_ntop() Example


<?php
$packed = chr(127) . chr(0) . chr(0) . chr(1);
$expanded = inet_ntop($packed);

/* Outputs: 127.0.0.1 */
echo $expanded;

$packed = str_repeat(chr(0), 15) . chr(1);
$expanded = inet_ntop($packed);

/* Outputs: ::1 */
echo $expanded;
?>

Notes

ChangeLog

Version	Description
5.3.0	This function is now available on Windows platforms


For people who need this function but don't have it, I could write a function which should give almost the same result.



<?php

function my_inet_ntop($ip) {

    if (strlen($ip)==4) {

        // ipv4

        list(,$ip)=unpack('N',$ip);

        $ip=long2ip($ip);

    } elseif(strlen($ip)==16) {

        // ipv6

        $ip=bin2hex($ip);

        $ip=substr(chunk_split($ip,4,':'),0,-1);

        $ip=explode(':',$ip);

        $res='';

        foreach($ip as $seg) {

            while($seg{0}=='0') $seg=substr($seg,1);

            if ($seg!='') {

                $res.=($res==''?'':':').$seg;

            } else {

                if (strpos($res,'::')===false) {

                    if (substr($res,-1)==':') continue;

                    $res.=':';

                    continue;

                }

                $res.=($res==''?'':':').'0';

            }

        }

        $ip=$res;

    }

    return $ip;

}

?>



I followed IPv6 reprenstation rules :

- A series of "0"s in a 16bit block can by represented by "0".

- A series of blocks containing only "0"s can be suppressed and represented by "::" (this can be done only once)



(source : http://www.ipv6style.jp/en/faq/latest.shtml#2003022112 )



Example: 

<?php

$packed = str_repeat(chr(0), 15) . chr(1);

$expanded = my_inet_ntop($packed);



/* Outputs: ::1 */

echo $expanded;

?>



I checked in CVS (2005-04-25) and didn't find the inet_ntop function (I really needed to handle IPv6) so I implemented it myself !

mirko dot steiner at slashdevslashnull dot de
23-Mar-2005 11:08


i've used this nice one oneline code:



<?PHP

$one     = 192;

$two     = 168;

$three     = 1;

$four    = 1;

                            

$ip = $one*pow(256,3) + $two*pow(256,2) + $three*pow(256,1) + $four*pow(256,0);

                            

echo $ip;

?>



you can also put the first one, shift them by 24 bits to the right, take the secod and shift them by 16, the 3rd by 8 and put thouse all together bitwise...

add a note

inet_pton

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Last updated: Fri, 27 Jun 2008