Detect clients with Proxy Servers via PHP [duplicate]

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Use the following 2 solutions in PHP.

Method 1: quick but does not work with anonymous proxies

$proxy_headers = array(
    'HTTP_VIA',
    'HTTP_X_FORWARDED_FOR',
    'HTTP_FORWARDED_FOR',
    'HTTP_X_FORWARDED',
    'HTTP_FORWARDED',
    'HTTP_CLIENT_IP',
    'HTTP_FORWARDED_FOR_IP',
    'VIA',
    'X_FORWARDED_FOR',
    'FORWARDED_FOR',
    'X_FORWARDED',
    'FORWARDED',
    'CLIENT_IP',
    'FORWARDED_FOR_IP',
    'HTTP_PROXY_CONNECTION'
    );
foreach($proxy_headers as $x){
    if (isset($_SERVER[$x])) die("You are using a proxy!");
}

Method 2: portscan back to the origin IP at the normal proxy ports used.

$ports = array(8080,80,81,1080,6588,8000,3128,553,554,4480);
foreach($ports as $port) {
     if (@fsockopen($_SERVER['REMOTE_ADDR'], $port, $errno, $errstr, 30)) {
          die("You are using a proxy!");
     }
 }

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