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<?php 
// http://stackoverflow.com/questions/858357/detect-clients-with-proxy-servers-via-php
// boolean coming empty: http://stackoverflow.com/questions/9042002/php-printed-boolean-value-is-empty-why
  /*
A boolean can always be represented as a 1 or a 0, but that's not what you get when you convert it to a string.

If you want it to be represented as an integer, cast it to one:  $intVar = (int) $boolVar;
 A boolean TRUE value is converted to the string "1". Boolean FALSE is converted to "" (the empty string). 
 This allows conversion back and forth between boolean and string values. 
*/  
 	$value_proxy = (int)detectProxy() ;
 	// Detect if client is using a Proxy 
 	if ( detectProxy() ) {
	 	$client_proxy = 'Client is using a proxy';
 	}
 	else { 
	 	$client_proxy = 'Client is not using a proxy' ;
	}


function detectProxy () {
    $proxy_headers = array(
        'HTTP_VIA',
        'HTTP_X_FORWARDED_FOR',
        'HTTP_FORWARDED_FOR',
        'HTTP_X_FORWARDED',
        'HTTP_FORWARDED',
        'HTTP_CLIENT_IP',
        'HTTP_FORWARDED_FOR_IP',
        'VIA',
        'X_FORWARDED_FOR',
        'FORWARDED_FOR',
        'X_FORWARDED',
        'FORWARDED',
        'CLIENT_IP',
        'FORWARDED_FOR_IP',
        'HTTP_PROXY_CONNECTION'
    );
    foreach($proxy_headers as $x){
        if (isset($_SERVER[$x])) 
        	return true;
    }
    
    return false;
}