function post_captcha($user_response) {
    $fields_string = '';
    $fields = array(
    'secret' => '[SECRET KEY KEPT HIDDEN]',
    'response' => $user_response
    );
    foreach($fields as $key=>$value)
    $fields_string .= $key . '=' . $value . '&';
    $fields_string = rtrim($fields_string, '&');

    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, 'https://www.google.com/recaptcha/api/siteverify');
    curl_setopt($ch, CURLOPT_POST, count($fields));
    curl_setopt($ch, CURLOPT_POSTFIELDS, $fields_string);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, True);

    $result = curl_exec($ch);
    curl_close($ch);

    return json_decode($result, true);
}

$res = post_captcha($_POST['g-recaptcha-response']);

if (!$res['success']) {
    $output = "<div class='warning-message'><b>Warning:</b>Complete the RECAPTCHA</div>";
} else {
if(isset($_POST['submit'])) {
    $username = strip_tags(stripslashes(mysqli_real_escape_string($conn, $_POST['username'])));
    $email = strip_tags(stripslashes(mysqli_real_escape_string($conn, $_POST['email'])));
    $password = $_POST['password'];
    $conpass = $_POST['conpass'];

    $passHash = password_hash($password, PASSWORD_BCRYPT);
    $usern = str_replace(' ','',$username);
    $ip = $_SERVER['REMOTE_ADDR'];

    if ($conpass !== $password) {
        $output = "<div class='warning-message'>Your passwords do not match!</div>";
    }

    $usercheck = $conn->query("SELECT username FROM users WHERE username='$username'");
    if ($usercheck->num_rows > 0) {
        $output = "<div class='warning-message'>Username is taken</div>";
    }
	$emailcheck = $conn->query("SELECT email FROM users WHERE email='$email'");
    if ($emailcheck->num_rows > 0) {
        $msg = "<div class='warning-message'>Email is taken.</div>";
    }

    if(strlen($username) < 3 || strlen($username) > 20){
        $output = "<div class='warning-message'><b>Warning:</b> Your Username must be 3-20 characters long.</div>";
    }

	if(strlen($password) < 6 || strlen($password) > 100) {
    	$output = "<div class='warning-message'><b>Warning:</b> Your Password must be 6-100 characters long.</div>";
	}

    if(empty($output)) {
        $query = $conn->query("INSERT INTO `users`(username,email,password,ip,signupdate) VALUES ('$usern','$email','$passHash','$ip',$date')");
        if ($query) {
            header("Location: ../account/");
        }else {
            $output = "<div class='warning-message'><b>Warning: </b>An Error has occurred!</div>";
        }
    }
}
}