Re: PHP Class for IP CIDR notation
| From: | Mark | Date: | Thu, 05 Jun 2003 15:31:46 +0000 |
| Subject: | Re: PHP Class for IP CIDR notation | ||
| References: | 1 | Groups: | php.general |
| Request: | Send a blank email to php-general+get-150371@lists.php.net to get a copy of this message | ||
Here's a quick function of the top of my head. I'm not sure if
x.x.0.x or x.0.x.x are valid IP addresses. Adjust as necessary.
<?
function cidr($initial_ip, $net_prefix=32) {
$octet=explode(".",$initial_ip);
$num_ips=pow(2,(32-$net_prefix));
$ip_list[]=implode(".",$octet);
for ($i=1;$i<$num_ips;$i++) {
if ($octet[3]<256) {
$octet[3]++;
}
if ($octet[3]==256) {
$octet[2]++;
$octet[3]=0;
}
if ($octet[2]==256) {
$octet[1]++;
$octet[2]=0;
}
if ($octet[1]==256) {
$octet[0]++;
$octet[1]=0;
}
if ($octet[0]>255) {
echo "First octet of IP address cannot exceed 255";
return false;
}
$ip_list[]=implode(".",$octet);
}
return $ip_list;
}
$arr=cidr("192.168.1.0",23);
echo "<pre>";
print_r($arr);
echo "</pre>";
?>
--- Rob Lacey <php@extrememetal.co.uk> wrote:
> does anyone know of a class that is able to extrapolate a list of
> IPs given an
> address in cidr notation. I have used the Net::Netmask module in
> perl, so I
> was just wondering if there was a PHP equivalent.
>
> Thanks
>
> Rob
>
> --
> PHP General Mailing List (http://www.php.net/)
> To unsubscribe, visit: http://www.php.net/unsub.php
>
=====
Mark Weinstock
mark_weinstock@yahoo.com
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