Gazelle/classes/class_proxies.php

<?
//Useful: http://www.robtex.com/cnet/
$AllowedProxies = array(
	//Opera Turbo (may include opera owned IPs that aren't used for Turbo, but shouldn't run much risk of exploitation)
	'64.255.180.*', //Norway
	'64.255.164.*', //Norway
	'80.239.242.*', //Poland
	'80.239.243.*', //Poland
	'91.203.96.*', //Norway
	'94.246.126.*', //Norway
	'94.246.127.*', //Norway
	'195.189.142.*', //Norway
	'195.189.143.*', //Norway
);

function proxyCheck($IP) {
	global $AllowedProxies;
	for ($i=0,$il=count($AllowedProxies);$i<$il;++$i) {
		//based on the wildcard principle it should never be shorter
		if (strlen($IP) < strlen($AllowedProxies[$i])) {
			continue;
		}
		
		//since we're matching bit for bit iterating from the start
		for ($j=0,$jl=strlen($IP);$j<$jl;++$j) {
			//completed iteration and no inequality
			if ($j == $jl-1 && $IP[$j] === $AllowedProxies[$i][$j]) {
				return true;
			}
			
			//wildcard
			if ($AllowedProxies[$i][$j] === '*') {
				return true;
			}
			
			//inequality found
			if ($IP[$j] !== $AllowedProxies[$i][$j]) {
				break;
			}
		}
	}
	return false;
}