Re: Sorting IP Address Data

And if the numbers are from different subnets, you could sort like so (assuming addresses are in a 1-dimensional array, here called $IpAddresses): function sort_address($IpAddresses) { $List = array(); foreach ($IpAddresses as $A) {

      list($x,$y,$z,$t) = explode('.', $A);
      $List[($x*16777216) + ($y*6553616) + ($z*256) + $t] = $A;

} ksort($List, SORT_NUMERIC); return array_values($List); } My first thought was to use the line

      $List[($x<<24) + ($y<<16) + ($z<<8) + $t] = $A;

instead, and gain a little speed advantage by bitshifting instead of multiplying, but then you'd need to force $x, $y, $z and $t to integers first. You might be able to do

      $List[(((int)$x)<<24) + (((int)$y)<<16) + (((int)$z)<<8) + $t] = $A;

or

      $List[(($x+0)<<24) + (($y x+0)<<16) + (($z x+0)<<8) + $t] = $A;

instead, though. If you wanted 'em in REVERSE order, use krsort() instead of ksort(). Usual 'untested code' warnings apply. - steve At 2:15 PM +1000 8/23/01, Chris Fry <chris@quillsoft.com.au> wrote:

Chris, Understand the problem now. All you need to keep is the last octect of the IP Address. The following code snippet generates an array entry for each ip. The array is then sorted and the result prepended with the base IP. <? $strBaseIP = "127.0.0.";

    for ($i=0;$i<=255;$i++) {
     $strIP = $i;
     print "IP = $strIP<br>";
     $aryIP[$i] = $strIP;

} sort($aryIP); for ($i=0;$i<=255;$i++) {

     $strIP = $strBaseIP.$aryIP[$i];

print "IP = $strIP<br>"; } ?> Pretty rough and ready but it should point you in the right direction. If you need to sort IP's from differnet subnets then you need to split the IP as per the previous suggestion. Chris Chris Aitken wrote:

Hi all, Just a quick one, I am pulling a whole Class C list of IP addresses, and im trying to sort them in order, but im getting it displayed 127.0.0.1 127.0.0.10 127.0.0.100 127.0.0.101 127.0.0.102 etc. Is there any other way to sort this thinking they are numbers, rather than text ? Thanks Chris --

      Chris Aitken - Administration/Database Designer - IDEAL Internet

email: chris@ideal.net.au phone: +61 2 4628 8888 fax: +61 2 4628 8890

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