note 52515 added to function.inet-ntop
| From: | MagicalTux at FF dot st | Date: | Wed, 04 May 2005 11:43:44 +0000 |
| Subject: | note 52515 added to function.inet-ntop | ||
| Groups: | php.notes | ||
| Request: | Send a blank email to php-notes+get-88911@lists.php.net to get a copy of this message | ||
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 !
----
Manual Page -- http://www.php.net/manual/en/function.inet-ntop.php
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