// ##################################################  ########################### 
// establish client IP address 
define('IPADDRESS', $_SERVER['REMOTE_ADDR']); 

// check several settings for the ip; good for not grabbing proxy IPs, but can still be problematic 
if ($_SERVER['HTTP_CLIENT_IP']) 
{ 
    define('ALT_IP', $_SERVER['HTTP_CLIENT_IP']); 
} 
else if ($_SERVER['HTTP_X_FORWARDED_FOR'] AND preg_match_all('#\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3  }#s', $_SERVER['HTTP_X_FORWARDED_FOR'], $matches)) 
{ 
    // make sure we dont pick up an internal IP defined by RFC1918 
    foreach ($matches[0] AS $ip) 
    { 
        if (!preg_match("#^(10|172\.16|192\.168)\.#", $ip)) 
        { 
            define('ALT_IP', $ip); 
            break; 
        } 
    } 
} 
else if ($_SERVER['HTTP_FROM']) 
{ 
    define('ALT_IP', $_SERVER['HTTP_FROM']); 
} 
else 
{ 
    define('ALT_IP', $_SERVER['REMOTE_ADDR']); 
}

// ##################################################  ########################### 
// establish client IP address 
// check several settings for the ip; good for not grabbing proxy IPs, but can still be problematic 
if ($_SERVER['HTTP_X_FORWARDED_FOR'] AND preg_match_all('#\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3  }#s', $_SERVER['HTTP_X_FORWARDED_FOR'], $matches)) 
{ 
    // make sure we dont pick up an internal IP defined by RFC1918 
    foreach ($matches[0] AS $ip) 
    { 
        if (!preg_match("#^(127|10|172\.16|192\.168)\.#", $ip)) 
        { 
            define('IPADDRESS', $ip); 
            define('ALT_IP', $_SERVER['HTTP_CLIENT_IP']); 
            define('ALT_IP2', $_SERVER['REMOTE_ADDR']); 
            break; 
        } 
    } 
} 
else if ($_SERVER['HTTP_CLIENT_IP']) 
{ 
    define('IPADDRESS', $_SERVER['HTTP_CLIENT_IP']); 
    define('ALT_IP', $_SERVER['REMOTE_ADDR']); 
    define('ALT_IP2', 'N/A'); 
     
} 
else if($_SERVER['REMOTE_ADDR']) 
{ 
    define('IPADDRESS', $_SERVER['REMOTE_ADDR']); 
    define('ALT_IP', 'N/A'); 
    define('ALT_IP2', 'N/A'); 
} 
else if($_SERVER['HTTP_FROM']) 
{ 
    define('ALT_IP', $_SERVER['REMOTE_ADDR']); 
    define('ALT_IP2', 'N/A'); 
    define('IPADDRESS', $_SERVER['HTTP_FROM']); 
}else{ 
    define('IPADDRESS', 'Anonymous'); 
    define('ALT_IP2', 'Anonymous'); 
    define('ALT_IP', 'Anonymous');     
} 

if(!defined('IPADDRESS') || !defined('ALT_IP')){ 
    define('IPADDRESS', 'Anonymous'); 
    define('ALT_IP', 'Anonymous'); 
    define('ALT_IP2', 'Anonymous');     
}

define('SESSION_IDHASH', md5($_SERVER['HTTP_USER_AGENT'] . ALT_IP )); // this should *never* change during a session 
define('SESSION_HOST', substr(IPADDRESS, 0, 15)); 
define('USER_AGENT', $_SERVER['HTTP_USER_AGENT']); 
define('REFERRER', $_SERVER['HTTP_REFERER']);

define('SESSION_IDHASH', md5($_SERVER['HTTP_USER_AGENT'] . substr(IPADDRESS, 0, 15) )); // this should *never* change during a session 
define('SESSION_HOST', substr(IPADDRESS, 0, 15)); 
define('USER_AGENT', $_SERVER['HTTP_USER_AGENT']); 
define('REFERRER', $_SERVER['HTTP_REFERER']);