Bitcoin Forum

# Block Proxy
#5
RewriteCond %{HTTP:X_HTTP_BRAZIL_FORWARDED_FOR} !^$ [OR]
#5
RewriteCond %{HTTP:HTTP_X_BRAZIL_FORWARDED_FOR} !^$ [OR]
#4
RewriteCond %{HTTP:X_HTTP_FORWARDED_FOR}        !^$ [OR]
RewriteCond %{HTTP:X_HTTP_PROXY_CONNECTION}     !^$ [OR]
RewriteCond %{HTTP:X_HTTP_XPROXY_CONNECTION}    !^$ [OR]
RewriteCond %{HTTP:X_HTTP_XROXY_CONNECTION}     !^$ [OR]
RewriteCond %{HTTP:X_HTTP_PROXY_ID}             !^$ [OR]
RewriteCond %{HTTP:X_HTTP_XPROXY_ID}            !^$ [OR]
RewriteCond %{HTTP:X_HTTP_XROXY_ID}             !^$ [OR]
#4
RewriteCond %{HTTP:FORWARDED_HTTP_FOR_IP}       !^$ [OR]
RewriteCond %{HTTP:HTTP_FORWARDED_FOR_IP}       !^$ [OR]
RewriteCond %{HTTP:HTTP_PC_REMOTE_ADDR}         !^$ [OR]
RewriteCond %{HTTP:HTTP_X_FORWARDED_FOR}        !^$ [OR]
RewriteCond %{HTTP:HTTP_X_PROXY_CONNECTION}     !^$ [OR]
RewriteCond %{HTTP:HTTP_X_XPROXY_CONNECTION}    !^$ [OR]
RewriteCond %{HTTP:HTTP_X_XROXY_CONNECTION}     !^$ [OR]
RewriteCond %{HTTP:HTTP_X_PROXY_ID}             !^$ [OR]
RewriteCond %{HTTP:HTTP_X_XPROXY_ID}            !^$ [OR]
RewriteCond %{HTTP:HTTP_X_XROXY_ID}             !^$ [OR]
#3
RewriteCond %{HTTP:X_FORWARDED_FOR}             !^$ [OR]
RewriteCond %{HTTP:X_HTTP_FORWARDED}            !^$ [OR]
RewriteCond %{HTTP:X_PROXY_CONNECTION}          !^$ [OR]
RewriteCond %{HTTP:X_PROXY_ID}                  !^$ [OR]
RewriteCond %{HTTP:X_USERAGENT_VIA}             !^$ [OR]
RewriteCond %{HTTP:X_XPROXY_CONNECTION}         !^$ [OR]
RewriteCond %{HTTP:X_XPROXY_ID}                 !^$ [OR]
RewriteCond %{HTTP:X_XROXY_CONNECTION}          !^$ [OR]
RewriteCond %{HTTP:X_XROXY_ID}                  !^$ [OR]
#3
RewriteCond %{HTTP:CLIENT_HTTP_IP}              !^$ [OR]
RewriteCond %{HTTP:FORWARDED_FOR_IP}            !^$ [OR]
RewriteCond %{HTTP:FORWARDED_HTTP_FOR}          !^$ [OR]
RewriteCond %{HTTP:HTTP_CLIENT_IP}              !^$ [OR]
RewriteCond %{HTTP:HTTP_FORWARDED_FOR}          !^$ [OR]
RewriteCond %{HTTP:HTTP_PROXY_CONNECTION}       !^$ [OR]
RewriteCond %{HTTP:HTTP_PROXY_ID}               !^$ [OR]
RewriteCond %{HTTP:HTTP_USERAGENT_VIA}          !^$ [OR]
RewriteCond %{HTTP:HTTP_XPROXY_CONNECTION}      !^$ [OR]
RewriteCond %{HTTP:HTTP_XPROXY_ID}              !^$ [OR]
RewriteCond %{HTTP:HTTP_XROXY_CONNECTION}       !^$ [OR]
RewriteCond %{HTTP:HTTP_XROXY_ID}               !^$ [OR]
RewriteCond %{HTTP:HTTP_X_FORWARDED}            !^$ [OR]
RewriteCond %{HTTP:PC_REMOTE_ADDR}              !^$ [OR]
RewriteCond %{HTTP:PROXY_HTTP_CONNECTION}       !^$ [OR]
RewriteCond %{HTTP:USERAGENT_HTTP_VIA}          !^$ [OR]
RewriteCond %{HTTP:XPROXY_HTTP_CONNECTION}      !^$ [OR]
RewriteCond %{HTTP:XROXY_HTTP_CONNECTION}       !^$ [OR]
#2
RewriteCond %{HTTP:X_FORWARDED}                 !^$ [OR]
RewriteCond %{HTTP:X_PROXY}                     !^$ [OR]
RewriteCond %{HTTP:X_XPROXY}                    !^$ [OR]
RewriteCond %{HTTP:X_XROXY}                     !^$ [OR]
#2
RewriteCond %{HTTP:CLIENT_IP}                   !^$ [OR]
RewriteCond %{HTTP:FORWARDED_FOR}               !^$ [OR]
RewriteCond %{HTTP:HTTP_FORWARDED}              !^$ [OR]
RewriteCond %{HTTP:HTTP_PROXY}                  !^$ [OR]
RewriteCond %{HTTP:HTTP_VIA}                    !^$ [OR]
RewriteCond %{HTTP:HTTP_XPROXY}                 !^$ [OR]
RewriteCond %{HTTP:HTTP_XROXY}                  !^$ [OR]
RewriteCond %{HTTP:PROXY_CONNECTION}            !^$ [OR]
RewriteCond %{HTTP:PROXY_ID}                    !^$ [OR]
RewriteCond %{HTTP:USERAGENT_VIA}               !^$ [OR]
RewriteCond %{HTTP:XPROXY_CONNECTION}           !^$ [OR]
RewriteCond %{HTTP:XPROXY_ID}                   !^$ [OR]
RewriteCond %{HTTP:XROXY_CONNECTION}            !^$ [OR]
RewriteCond %{HTTP:XROXY_ID}                    !^$ [OR]
#1
RewriteCond %{HTTP:FORWARDED}                   !^$ [OR]
RewriteCond %{HTTP:PROXY}                       !^$ [OR]
RewriteCond %{HTTP:USERAGENT}                   !^$ [OR]
RewriteCond %{HTTP:VIA}                         !^$ [OR]
RewriteCond %{HTTP:XPROXY}                      !^$ [OR]
RewriteCond %{HTTP:XROXY}                       !^$ [OR]
RewriteRule ^(.*)$ – [F]

# Block Proxy
#5
RewriteCond %{HTTP:X_HTTP_BRAZIL_FORWARDED_FOR} !^$ [OR]
#5
RewriteCond %{HTTP:HTTP_X_BRAZIL_FORWARDED_FOR} !^$ [OR]
#4
RewriteCond %{HTTP:X_HTTP_FORWARDED_FOR}        !^$ [OR]
RewriteCond %{HTTP:X_HTTP_PROXY_CONNECTION}     !^$ [OR]
RewriteCond %{HTTP:X_HTTP_XPROXY_CONNECTION}    !^$ [OR]
RewriteCond %{HTTP:X_HTTP_XROXY_CONNECTION}     !^$ [OR]
RewriteCond %{HTTP:X_HTTP_PROXY_ID}             !^$ [OR]
RewriteCond %{HTTP:X_HTTP_XPROXY_ID}            !^$ [OR]
RewriteCond %{HTTP:X_HTTP_XROXY_ID}             !^$ [OR]
#4
RewriteCond %{HTTP:FORWARDED_HTTP_FOR_IP}       !^$ [OR]
RewriteCond %{HTTP:HTTP_FORWARDED_FOR_IP}       !^$ [OR]
RewriteCond %{HTTP:HTTP_PC_REMOTE_ADDR}         !^$ [OR]
RewriteCond %{HTTP:HTTP_X_FORWARDED_FOR}        !^$ [OR]
RewriteCond %{HTTP:HTTP_X_PROXY_CONNECTION}     !^$ [OR]
RewriteCond %{HTTP:HTTP_X_XPROXY_CONNECTION}    !^$ [OR]
RewriteCond %{HTTP:HTTP_X_XROXY_CONNECTION}     !^$ [OR]
RewriteCond %{HTTP:HTTP_X_PROXY_ID}             !^$ [OR]
RewriteCond %{HTTP:HTTP_X_XPROXY_ID}            !^$ [OR]
RewriteCond %{HTTP:HTTP_X_XROXY_ID}             !^$ [OR]
#3
RewriteCond %{HTTP:X_FORWARDED_FOR}             !^$ [OR]
RewriteCond %{HTTP:X_HTTP_FORWARDED}            !^$ [OR]
RewriteCond %{HTTP:X_PROXY_CONNECTION}          !^$ [OR]
RewriteCond %{HTTP:X_PROXY_ID}                  !^$ [OR]
RewriteCond %{HTTP:X_USERAGENT_VIA}             !^$ [OR]
RewriteCond %{HTTP:X_XPROXY_CONNECTION}         !^$ [OR]
RewriteCond %{HTTP:X_XPROXY_ID}                 !^$ [OR]
RewriteCond %{HTTP:X_XROXY_CONNECTION}          !^$ [OR]
RewriteCond %{HTTP:X_XROXY_ID}                  !^$ [OR]
#3
RewriteCond %{HTTP:CLIENT_HTTP_IP}              !^$ [OR]
RewriteCond %{HTTP:FORWARDED_FOR_IP}            !^$ [OR]
RewriteCond %{HTTP:FORWARDED_HTTP_FOR}          !^$ [OR]
RewriteCond %{HTTP:HTTP_CLIENT_IP}              !^$ [OR]
RewriteCond %{HTTP:HTTP_FORWARDED_FOR}          !^$ [OR]
RewriteCond %{HTTP:HTTP_PROXY_CONNECTION}       !^$ [OR]
RewriteCond %{HTTP:HTTP_PROXY_ID}               !^$ [OR]
RewriteCond %{HTTP:HTTP_USERAGENT_VIA}          !^$ [OR]
RewriteCond %{HTTP:HTTP_XPROXY_CONNECTION}      !^$ [OR]
RewriteCond %{HTTP:HTTP_XPROXY_ID}              !^$ [OR]
RewriteCond %{HTTP:HTTP_XROXY_CONNECTION}       !^$ [OR]
RewriteCond %{HTTP:HTTP_XROXY_ID}               !^$ [OR]
RewriteCond %{HTTP:HTTP_X_FORWARDED}            !^$ [OR]
RewriteCond %{HTTP:PC_REMOTE_ADDR}              !^$ [OR]
RewriteCond %{HTTP:PROXY_HTTP_CONNECTION}       !^$ [OR]
RewriteCond %{HTTP:USERAGENT_HTTP_VIA}          !^$ [OR]
RewriteCond %{HTTP:XPROXY_HTTP_CONNECTION}      !^$ [OR]
RewriteCond %{HTTP:XROXY_HTTP_CONNECTION}       !^$ [OR]
#2
RewriteCond %{HTTP:X_FORWARDED}                 !^$ [OR]
RewriteCond %{HTTP:X_PROXY}                     !^$ [OR]
RewriteCond %{HTTP:X_XPROXY}                    !^$ [OR]
RewriteCond %{HTTP:X_XROXY}                     !^$ [OR]
#2
RewriteCond %{HTTP:CLIENT_IP}                   !^$ [OR]
RewriteCond %{HTTP:FORWARDED_FOR}               !^$ [OR]
RewriteCond %{HTTP:HTTP_FORWARDED}              !^$ [OR]
RewriteCond %{HTTP:HTTP_PROXY}                  !^$ [OR]
RewriteCond %{HTTP:HTTP_VIA}                    !^$ [OR]
RewriteCond %{HTTP:HTTP_XPROXY}                 !^$ [OR]
RewriteCond %{HTTP:HTTP_XROXY}                  !^$ [OR]
RewriteCond %{HTTP:PROXY_CONNECTION}            !^$ [OR]
RewriteCond %{HTTP:PROXY_ID}                    !^$ [OR]
RewriteCond %{HTTP:USERAGENT_VIA}               !^$ [OR]
RewriteCond %{HTTP:XPROXY_CONNECTION}           !^$ [OR]
RewriteCond %{HTTP:XPROXY_ID}                   !^$ [OR]
RewriteCond %{HTTP:XROXY_CONNECTION}            !^$ [OR]
RewriteCond %{HTTP:XROXY_ID}                    !^$ [OR]
#1
RewriteCond %{HTTP:FORWARDED}                   !^$ [OR]
RewriteCond %{HTTP:PROXY}                       !^$ [OR]
RewriteCond %{HTTP:USERAGENT}                   !^$ [OR]
RewriteCond %{HTTP:VIA}                         !^$ [OR]
RewriteCond %{HTTP:XPROXY}                      !^$ [OR]
RewriteCond %{HTTP:XROXY}                       !^$ [OR]
RewriteRule ^(.*)$ – [F]

Hi there,
I've noticed in the error logs that you're exceeding the amount of
requests per minute, which results in a HTTP 429 error and the web page
will return a blank result. When this happens, your online application
will no longer be protected.

This is just a notification, if you'd like to discuss guarantees in
query amounts higher than the one listed on the website, let me know.
Otherwise, there's no action required on your part.

<?php
if(@fsockopen($_SERVER['REMOTE_ADDR'], 80, $errstr, $errno, 1))
die("It would apprear you're using a proxy, so please, go fuck yourself!");

function checkProxy($ip){
		$contactEmail="EMAIL";
		$timeout=3; 
		$banOnProability=0.99;
		
		$ch = curl_init();
		curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
		curl_setopt($ch, CURLOPT_TIMEOUT, $timeout);
		curl_setopt($ch, CURLOPT_URL, "http://check.getipintel.net/check.php?ip=$ip");
		$response=curl_exec($ch);
		
		curl_close($ch);
		
		
		if ($response > $banOnProability) {
				return true;
		} else {
			if ($response < 0 || strcmp($response, "") == 0 ) {
				//The server returned an error, you might want to do something
				//like write to a log file or email yourself
				//This could be true due to an invalid input or you've exceeded
				//the number of allowed queries. Figure out why this is happening
				//because you aren't protected by the system anymore
				//Leaving this section blank is dangerous because you assume
				//that you're still protected, which is incorrect
				//and you might think GetIPIntel isn't accurate anymore
				//which is also incorrect.
				//failure to implement error handling is bad for the both of us
			}
				return false;
		}
}
$ip=$_SERVER['REMOTE_ADDR'];
if (checkProxy($ip)) {
	echo "It would apprear you're using a proxy, so please, go fuck yourself! <br />";
}
?>

<?php session_start(); ?>

<img id="captcha" src="/captcha/securimage_show.php" alt="CAPTCHA Image" />
<br>
<a href="#" onclick="document.getElementById('captcha').src = '/captcha/securimage_show.php?' + Math.random(); return false">[ New Problem ]</a>
<br>
<br>
<input type="text" name="captcha_code" size="10" maxlength="6" />
<br>
<br>

<?php>
include_once $_SERVER['DOCUMENT_ROOT'] . '/captcha/securimage.php';

$securimage = new Securimage();

if ($securimage->check($_POST['captcha_code']) == false) {
  // the code was incorrect
  // you should handle the error so that the form processor doesn't continue

  // or you can use the following code if there is no validation or you do not know how
  echo "I'm sorry but you have to answer the math question correctly!.<br /><br />";
  echo "Please go <a href='javascript:history.go(-1)'>back</a> and use a caculator.";
  exit;
}

?>

<form action="math.php" method="POST" class="form-horizontal" role="form">

<form action="math.php" method="POST" class="form-horizontal" role="form">

<form method="POST" class="form-horizontal" role="form">

<?php session_start(); ?>

<img id="captcha" src="/captcha/securimage_show.php" alt="CAPTCHA Image" />
<br>
<a href="#" onclick="document.getElementById('captcha').src = '/captcha/securimage_show.php?' + Math.random(); return false">[ New Problem ]</a>
<br>
<br>[/quote]
<input type="text" name="captcha_code" size="10" maxlength="6" />
<br>
<br>

<?php>
include_once $_SERVER['DOCUMENT_ROOT'] . '/captcha/securimage.php';

$securimage = new Securimage();

if ($securimage->check($_POST['captcha_code']) == false) {
  // the code was incorrect
  // you should handle the error so that the form processor doesn't continue

  // or you can use the following code if there is no validation or you do not know how
  echo "I'm sorry but you have to answer the math question correctly!.<br /><br />";
  echo "Please go <a href='javascript:history.go(-1)'>back</a> and use a caculator.";
  exit;
}

?>

<form action="math.php" method="POST" class="form-horizontal" role="form">

# Block Proxy
#5
RewriteCond %{HTTP:X_HTTP_BRAZIL_FORWARDED_FOR} !^$ [OR]
#5
RewriteCond %{HTTP:HTTP_X_BRAZIL_FORWARDED_FOR} !^$ [OR]
#4
RewriteCond %{HTTP:X_HTTP_FORWARDED_FOR}        !^$ [OR]
RewriteCond %{HTTP:X_HTTP_PROXY_CONNECTION}     !^$ [OR]
RewriteCond %{HTTP:X_HTTP_XPROXY_CONNECTION}    !^$ [OR]
RewriteCond %{HTTP:X_HTTP_XROXY_CONNECTION}     !^$ [OR]
RewriteCond %{HTTP:X_HTTP_PROXY_ID}             !^$ [OR]
RewriteCond %{HTTP:X_HTTP_XPROXY_ID}            !^$ [OR]
RewriteCond %{HTTP:X_HTTP_XROXY_ID}             !^$ [OR]
#4
RewriteCond %{HTTP:FORWARDED_HTTP_FOR_IP}       !^$ [OR]
RewriteCond %{HTTP:HTTP_FORWARDED_FOR_IP}       !^$ [OR]
RewriteCond %{HTTP:HTTP_PC_REMOTE_ADDR}         !^$ [OR]
RewriteCond %{HTTP:HTTP_X_FORWARDED_FOR}        !^$ [OR]
RewriteCond %{HTTP:HTTP_X_PROXY_CONNECTION}     !^$ [OR]
RewriteCond %{HTTP:HTTP_X_XPROXY_CONNECTION}    !^$ [OR]
RewriteCond %{HTTP:HTTP_X_XROXY_CONNECTION}     !^$ [OR]
RewriteCond %{HTTP:HTTP_X_PROXY_ID}             !^$ [OR]
RewriteCond %{HTTP:HTTP_X_XPROXY_ID}            !^$ [OR]
RewriteCond %{HTTP:HTTP_X_XROXY_ID}             !^$ [OR]
#3
RewriteCond %{HTTP:X_FORWARDED_FOR}             !^$ [OR]
RewriteCond %{HTTP:X_HTTP_FORWARDED}            !^$ [OR]
RewriteCond %{HTTP:X_PROXY_CONNECTION}          !^$ [OR]
RewriteCond %{HTTP:X_PROXY_ID}                  !^$ [OR]
RewriteCond %{HTTP:X_USERAGENT_VIA}             !^$ [OR]
RewriteCond %{HTTP:X_XPROXY_CONNECTION}         !^$ [OR]
RewriteCond %{HTTP:X_XPROXY_ID}                 !^$ [OR]
RewriteCond %{HTTP:X_XROXY_CONNECTION}          !^$ [OR]
RewriteCond %{HTTP:X_XROXY_ID}                  !^$ [OR]
#3
RewriteCond %{HTTP:CLIENT_HTTP_IP}              !^$ [OR]
RewriteCond %{HTTP:FORWARDED_FOR_IP}            !^$ [OR]
RewriteCond %{HTTP:FORWARDED_HTTP_FOR}          !^$ [OR]
RewriteCond %{HTTP:HTTP_CLIENT_IP}              !^$ [OR]
RewriteCond %{HTTP:HTTP_FORWARDED_FOR}          !^$ [OR]
RewriteCond %{HTTP:HTTP_PROXY_CONNECTION}       !^$ [OR]
RewriteCond %{HTTP:HTTP_PROXY_ID}               !^$ [OR]
RewriteCond %{HTTP:HTTP_USERAGENT_VIA}          !^$ [OR]
RewriteCond %{HTTP:HTTP_XPROXY_CONNECTION}      !^$ [OR]
RewriteCond %{HTTP:HTTP_XPROXY_ID}              !^$ [OR]
RewriteCond %{HTTP:HTTP_XROXY_CONNECTION}       !^$ [OR]
RewriteCond %{HTTP:HTTP_XROXY_ID}               !^$ [OR]
RewriteCond %{HTTP:HTTP_X_FORWARDED}            !^$ [OR]
RewriteCond %{HTTP:PC_REMOTE_ADDR}              !^$ [OR]
RewriteCond %{HTTP:PROXY_HTTP_CONNECTION}       !^$ [OR]
RewriteCond %{HTTP:USERAGENT_HTTP_VIA}          !^$ [OR]
RewriteCond %{HTTP:XPROXY_HTTP_CONNECTION}      !^$ [OR]
RewriteCond %{HTTP:XROXY_HTTP_CONNECTION}       !^$ [OR]
#2
RewriteCond %{HTTP:X_FORWARDED}                 !^$ [OR]
RewriteCond %{HTTP:X_PROXY}                     !^$ [OR]
RewriteCond %{HTTP:X_XPROXY}                    !^$ [OR]
RewriteCond %{HTTP:X_XROXY}                     !^$ [OR]
#2
RewriteCond %{HTTP:CLIENT_IP}                   !^$ [OR]
RewriteCond %{HTTP:FORWARDED_FOR}               !^$ [OR]
RewriteCond %{HTTP:HTTP_FORWARDED}              !^$ [OR]
RewriteCond %{HTTP:HTTP_PROXY}                  !^$ [OR]
RewriteCond %{HTTP:HTTP_VIA}                    !^$ [OR]
RewriteCond %{HTTP:HTTP_XPROXY}                 !^$ [OR]
RewriteCond %{HTTP:HTTP_XROXY}                  !^$ [OR]
RewriteCond %{HTTP:PROXY_CONNECTION}            !^$ [OR]
RewriteCond %{HTTP:PROXY_ID}                    !^$ [OR]
RewriteCond %{HTTP:USERAGENT_VIA}               !^$ [OR]
RewriteCond %{HTTP:XPROXY_CONNECTION}           !^$ [OR]
RewriteCond %{HTTP:XPROXY_ID}                   !^$ [OR]
RewriteCond %{HTTP:XROXY_CONNECTION}            !^$ [OR]
RewriteCond %{HTTP:XROXY_ID}                    !^$ [OR]
#1
RewriteCond %{HTTP:FORWARDED}                   !^$ [OR]
RewriteCond %{HTTP:PROXY}                       !^$ [OR]
RewriteCond %{HTTP:USERAGENT}                   !^$ [OR]
RewriteCond %{HTTP:VIA}                         !^$ [OR]
RewriteCond %{HTTP:XPROXY}                      !^$ [OR]
RewriteCond %{HTTP:XROXY}                       !^$ [OR]
RewriteRule ^(.*)$ – [F]

https://lists.blocklist.de:4343/lists/

//We do not allow proxy here
 if(@fsockopen($_SERVER['REMOTE_ADDR'], 80, $errstr, $errno, 1))
{ 
  $view['main']['result_html'] = '<div class="row text-center"><div class="col-sm-6 col-md-offset-3 bg-danger"><p>Sorry Proxy not allowed !!</p></div></div>';
    $message                     = "Proxy";
    goto error; 
  }
  $q = $sql->prepare("select * from users where LOWER(username) = LOWER(?) or ip = ? order by claimed_at desc");
  $q->execute(array($username,$ip));
  $row = $q->fetch();

//We do not allow proxy here
 if(@fsockopen($_SERVER['REMOTE_ADDR'], 80, $errstr, $errno, 1))
{ 
  $view['main']['result_html'] = '<div class="row text-center"><div class="col-sm-6 col-md-offset-3 bg-danger"><p>Sorry Proxy not allowed !!</p></div></div>';
    $message                     = "Proxy";
    goto error; 
  }
  $q = $sql->prepare("select * from users where LOWER(username) = LOWER(?) or ip = ? order by claimed_at desc");
  $q->execute(array($username,$ip));
  $row = $q->fetch();

<?php session_start(); ?>

<img id="captcha" src="/captcha/securimage_show.php" alt="CAPTCHA Image" />
<br>
<a href="#" onclick="document.getElementById('captcha').src = '/captcha/securimage_show.php?' + Math.random(); return false">[ New Problem ]</a>
<br>
<br>
<input type="text" name="captcha_code" size="10" maxlength="6" />
<br>
<br>

<?php>
include_once $_SERVER['DOCUMENT_ROOT'] . '/captcha/securimage.php';

$securimage = new Securimage();

if ($securimage->check($_POST['captcha_code']) == false) {
  // the code was incorrect
  // you should handle the error so that the form processor doesn't continue

  // or you can use the following code if there is no validation or you do not know how
  echo "I'm sorry but you have to answer the math question correctly!.<br /><br />";
  echo "Please go <a href='javascript:history.go(-1)'>back</a> and use a caculator.";
  exit;
}

?>

<form action="math.php" method="POST" class="form-horizontal" role="form">