如何使用PHP重定向整个范围/ IP地址块？

Question

I'm using the following snippet to redirect an array of IP addresses. I was wondering how I would go about adding an entire range/block of IP addresses to my dissallowed array...

<?php // Let's redirect certain IP addresses to a "Page Not Found"
$disallowed = array("76.105.99.106");
$ip = $_SERVER['REMOTE_ADDR']; 

if(in_array($ip, $disallowed)) {
 header("Location: http://google.com");
 exit;
}
?>

I tried using "76.105.99.*", "76.105.99", "76.105.99.0-76.105.99.255" without any luck.

I need to use PHP rather than mod_rewrite and .htaccess for other reasons.

Answer 1

Try the substr function:

$ip = '76.105.99.';
if (substr($_SERVER['REMOTE_ADDR'], 0, strlen($ip)) === $ip) {
    // deny access
}