Restriction based on IP ranges

I am building an admin panel. and I want to block certain IP ranges. I’m testing this on my localhost wamp server but ir doesn’t seem to redirect me.

<?php
   if($_SERVER['REMOTE_ADDR'] == '127.0.0..*') 
      header("Location: http://google.com");
   else
      echo "Hai";
?>

Any input is appreciated.

Answer

Is sufficient to use string comparison

if (strncmp('127.0.0.', $_SERVER['REMOTE_ADDR'], 8) === 0)
  header("Location: http://google.com");
else
  echo "Hai";

Update: Taken from the comments of inits answer

Suppose i want to block any IP coming from this range: 192.168.0.1-255. What would be the best solution for it ? Thanks.

Then just make the same string comparison against this block

if (strncmp('192.168.0.', $_SERVER['REMOTE_ADDR'], 10) === 0)
  header("Location: http://google.com");
else
  echo "Hai";

If you want to test the remote address against both blocks at once, you will probably put them together into one expression. This time we need a different approach

if (in_array(substr($_SERVER['REMOTE_ADDR'], 0, strrpos($_SERVER['REMOTE_ADDR'], '.')), array('127.0.0', '192.168.0'))) {
  header("Location: http://google.com");
else
  echo "Hai";

The substr()-part takes the IP until the last .. We can just try to find this string in a set (-> array) of IP-prefixes.