/**
* Return the address of the remote host.
* @return string the remote host address (or null)
*/
public static function getRemoteHostAddress()
{
$addr = null;
if (isset($_SERVER['REMOTE_ADDR'])) {
$addr = $_SERVER['REMOTE_ADDR'];
if (MyOOS_Utilities::isTrustedProxy($addr)) {
foreach (array('HTTP_X_FORWARDED_FOR', 'HTTP_CLIENT_IP') as $key) {
if (isset($_SERVER[$key]) &&
preg_match('/^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}$/', $_SERVER[$key])) {
$addr = $_SERVER[$key];
break;
}
}
}
}
return $addr;
}