<?

function security_getIP()
{
    $REMOTE_ADDR = isset($_SERVER['REMOTE_ADDR']) ? $_SERVER['REMOTE_ADDR'] : '';
    $HTTP_X_FORWARDED_FOR = isset($_SERVER['HTTP_X_FORWARDED_FOR']) ? $_SERVER['HTTP_X_FORWARDED_FOR'] : '';
    $HTTP_X_FORWARDED = isset($_SERVER['HTTP_X_FORWARDED']) ? $_SERVER['HTTP_X_FORWARDED'] : '';
    $HTTP_FORWARDED_FOR = isset($_SERVER['HTTP_FORWARDED_FOR']) ? $_SERVER['HTTP_FORWARDED_FOR'] : '';
    $HTTP_FORWARDED = isset($_SERVER['HTTP_FORWARDED']) ? $_SERVER['HTTP_FORWARDED'] : '';
    $HTTP_VIA = isset($_SERVER['HTTP_VIA']) ? $_SERVER['HTTP_VIA'] : '';
    $HTTP_X_COMING_FROM = isset($_SERVER['HTTP_X_COMING_FROM']) ? $_SERVER['HTTP_X_COMING_FROM'] : '';
    $HTTP_COMING_FROM = isset($_SERVER['HTTP_COMING_FROM']) ? $_SERVER['HTTP_COMING_FROM'] : '';

    // Gets the default ip sent by the user
    if (!empty($REMOTE_ADDR)) {
        $direct_ip = $REMOTE_ADDR;
    }

    // Gets the proxy ip sent by the user
    $proxy_ip     = '';
    if (!empty($HTTP_X_FORWARDED_FOR)) {
        $proxy_ip = $HTTP_X_FORWARDED_FOR;
    } elseif (!empty($HTTP_X_FORWARDED)) {
        $proxy_ip = $HTTP_X_FORWARDED;
    } elseif (!empty($HTTP_FORWARDED_FOR)) {
        $proxy_ip = $HTTP_FORWARDED_FOR;
    } elseif (!empty($HTTP_FORWARDED)) {
        $proxy_ip = $HTTP_FORWARDED;
    } elseif (!empty($HTTP_VIA)) {
        $proxy_ip = $HTTP_VIA;
    } elseif (!empty($HTTP_X_COMING_FROM)) {
        $proxy_ip = $HTTP_X_COMING_FROM;
    } elseif (!empty($HTTP_COMING_FROM)) {
        $proxy_ip = $HTTP_COMING_FROM;
    } // end if... elseif...

    // Returns the true IP if it has been found, else FALSE
    if (empty($proxy_ip)) {
        // True IP without proxy
        return $direct_ip;
    } else {
        $is_ip = preg_match('|^([0-9]{1,3}\.){3,3}[0-9]{1,3}|', $proxy_ip, $regs);
        if ($is_ip && (count($regs) > 0)) {
            // True IP behind a proxy
            return $regs[0];
        } else {
            // Can't define IP: there is a proxy but we don't have
            // information about the true IP
            return FALSE;
        }
    } // end if... else...
} // end of the 'getIp()' function


highlight_file(__FILE__);

?>