git.maemo.org Git - speedfreak/blob - Server/system/libraries/drivers/Captcha/Math.php

   1 <?php defined('SYSPATH') OR die('No direct access allowed.');
   2 /**
   3  * Captcha driver for "math" style.
   4  *
   5  * $Id: Math.php 3769 2008-12-15 00:48:56Z zombor $
   6  *
   7  * @package    Captcha
   8  * @author     Kohana Team
   9  * @copyright  (c) 2007-2008 Kohana Team
  10  * @license    http://kohanaphp.com/license.html
  11  */
  12 class Captcha_Math_Driver extends Captcha_Driver {
  13
  14         private $math_exercice;
  15
  16         /**
  17          * Generates a new Captcha challenge.
  18          *
  19          * @return  string  the challenge answer
  20          */
  21         public function generate_challenge()
  22         {
  23                 // Easy
  24                 if (Captcha::$config['complexity'] < 4)
  25                 {
  26                         $numbers[] = mt_rand(1, 5);
  27                         $numbers[] = mt_rand(1, 4);
  28                 }
  29                 // Normal
  30                 elseif (Captcha::$config['complexity'] < 7)
  31                 {
  32                         $numbers[] = mt_rand(10, 20);
  33                         $numbers[] = mt_rand(1, 10);
  34                 }
  35                 // Difficult, well, not really ;)
  36                 else
  37                 {
  38                         $numbers[] = mt_rand(100, 200);
  39                         $numbers[] = mt_rand(10, 20);
  40                         $numbers[] = mt_rand(1, 10);
  41                 }
  42
  43                 // Store the question for output
  44                 $this->math_exercice = implode(' + ', $numbers).' = ';
  45
  46                 // Return the answer
  47                 return array_sum($numbers);
  48         }
  49
  50         /**
  51          * Outputs the Captcha riddle.
  52          *
  53          * @param   boolean  html output
  54          * @return  mixed
  55          */
  56         public function render($html)
  57         {
  58                 return $this->math_exercice;
  59         }
  60
  61 } // End Captcha Math Driver Class