Ban Script! Supports specific IPs and even ranges

[Palyriot]

This banning script should work for any range in any quartile of the IP. Even [0-255].[0-255].[0-255].[0-255] will work. With every $ip_range value you add, it will only get a very small fraction of a second slower. Running the script with 100 ip ranges took 0.00264000892639 seconds.

Have Fun!

<?php

function checkban($ip, $banned_ip, $ip_ranges)
{
	$ipquartiles = explode('.', $ip);
	if (in_array($ip, $banned_ip))
	{
		return true;
		
	}
	
	if ($banned != true)
	{
		foreach($ip_ranges as $ip_range)
		{
			$quartiles = explode('.', $ip_range);
			for ($i = 0; $i <= 4; $i++)
			{
				if (preg_match('/\[([0-9]+)\-([0-9]+)\]/', $quartiles[$i], $matches))
				{
				    $start = $matches[1];
				    $end = $matches[2];
					if ($ipquartiles[$i] < $start || $ipquartiles[$i] > $end)
					{
						return false;
					}
					else
					{
						$banned = true;
					}
				}
				else
				{
					if ($quartiles[$i] != $ipquartiles[$i])
					{
						return false;
					}
				}
			}
		}
	}
	return $banned;
}

$banned_ip = array();
$banned_ip[] = '204.96.148.3';
$banned_ip[] = '205.162.217.141';

$ip_ranges = array();
$ip_ranges[] = '[0-255].0.0.1';

$ip = $_SERVER['REMOTE_ADDR'];

$banned = checkban($ip, $banned_ip, $ip_ranges);

if ($banned == true)
{
	echo 'banned!';
    //header("location: http://www.yahoo.com");
}
else
{
   // header("location: http://www.google.com");
   echo 'not banned';
}

?>