PHP to redirect IP addresses to different page

<?php
//array of ip's you wish to block.  Note that you can block an
//entire class by replacing it with 0, so to block a class c
//(254 computers) use something like 123.123.123.0
$blockIP = array('123.123.123.0','100.100.100.101');
 
$remote = explode('.',$_SERVER['REMOTE_ADDR']);
foreach($blockIP as $ip) {
  $goodIP = false;
	for($i=0;$i<4;$i++) {
    $ipSeg = explode('.',$ip);
    if($remote[$i] == $ipSeg[$i] || $ipSeg[$i] == '0') {
      //segment qualifies
      $goodIP = true;
    } else {
      //ip no good so move to the next
      $goodIP = false;
      continue 2;
    }
  }
  if($goodIP) {
    //ip passes so no need to check the rest
    $blockThisIP = $ip;
    break;
  }
 
}
//for convenience test $blockThisIP and process here
//replace www.crayola.com with the place you wish to
//send ip's too
if($blockThisIP) {
  //php header method - can only use this if the page
  //has not begin to display in the browser
  header('Location: http://www.crayola.com');
 
  //javascript redirection - use this method if browser has
  //begun to display page
  echo "<script type="text/javascript">
  window.location = "http://www.crayola.com";</script>";
}
?>