61 lines
1.2 KiB
PHP
61 lines
1.2 KiB
PHP
<?php defined('SYSPATH') OR die('No direct access allowed.');
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/**
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* Captcha driver for "math" style.
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*
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* $Id: Math.php 3769 2008-12-15 00:48:56Z zombor $
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*
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* @package Captcha
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* @author Kohana Team
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* @copyright (c) 2007-2008 Kohana Team
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* @license http://kohanaphp.com/license.html
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*/
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class Captcha_Math_Driver extends Captcha_Driver {
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private $math_exercice;
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/**
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* Generates a new Captcha challenge.
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*
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* @return string the challenge answer
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*/
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public function generate_challenge()
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{
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// Easy
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if (Captcha::$config['complexity'] < 4)
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{
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$numbers[] = mt_rand(1, 5);
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$numbers[] = mt_rand(1, 4);
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}
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// Normal
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elseif (Captcha::$config['complexity'] < 7)
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{
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$numbers[] = mt_rand(10, 20);
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$numbers[] = mt_rand(1, 10);
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}
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// Difficult, well, not really ;)
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else
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{
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$numbers[] = mt_rand(100, 200);
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$numbers[] = mt_rand(10, 20);
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$numbers[] = mt_rand(1, 10);
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}
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// Store the question for output
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$this->math_exercice = implode(' + ', $numbers).' = ';
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// Return the answer
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return array_sum($numbers);
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}
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/**
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* Outputs the Captcha riddle.
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*
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* @param boolean html output
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* @return mixed
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*/
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public function render($html)
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{
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return $this->math_exercice;
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}
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} // End Captcha Math Driver Class
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