which is best? preg, ereg, or !strncomp

Anon

What I want to do:

Remote addresses are in this format:
"xxx.xxx.xxx.xxx."

I want ANYONE visiting my page with a remote address beginning with "206.221.223.xxx" (the last 3 digits don't matter), to be redirected to another location.

Here is what I've BEEN using....but something tells me maybe I should use ereg or preg. If I SHOULD be using ereg, or preg, could someone please type the correct syntax that would be most efficient:

$z = $REMOTE_ADDR
$match = "206.221.223";
if (!strncmp($z, $match, strlen($match)))
{
$url= "/alternatelocation;
header("location: $url");
}

Also.... if you would be kind enough to take a moment to tell me something: As I look at the code I have been using, I would read it like this: "If string does NOT compare (remote address, match), go to alternate location." However, it seems to work the OPPOSITE! Anyway, should I be using this code anyway, or be using if (preg... or if(ereg....

Anon

<?
$ip_array = explode ('.', $REMOTE_ADDR);
if (
$ip_array[0] == '206' &&
$ip_array[1] == '221' &&
$ip_array[2] == '223')
{header ("location = http://www.redirect.com");}
?>

Anon

Looks fine to me. You could also have
if(substr($z,0,strlen($match))==$match) if it turns you on. I wouldn't use preg_match or ereg - you're not doing any regexp stuff, so those functions are overkill. (Personally, I wouldn't use ereg in any case; PCRE syntax is better developed, and the functions run faster.)

As for your other question: If str1 is less than str2, strncmp returns a number less than 0, if str1 is greater than str2, strncmp returns a number greater than 0, and if str1 is equal to str2, istrncmp returns a number equal to 0. And if(!something) is equivalent to if(something==0).

So what you're checking is "if remote address is NOT different from match, go to alternate location". What's throwing you is that there's a double negative there and you can only see half of it.

Is that clearer?

Anon

thank you!!!

Noerd is happy now :-)