File lass/captcha/text.php

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 1: <?php
 2: /*
 3:  You may not change or alter any portion of this comment or credits
 4:  of supporting developers from this source code or any supporting source code
 5:  which is considered copyrighted (c) material of the original comment or credit authors.
 6: 
 7:  This program is distributed in the hope that it will be useful,
 8:  but WITHOUT ANY WARRANTY; without even the implied warranty of
 9:  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
10: */
11: 
12: /**
13:  * CAPTCHA for text mode
14:  *
15:  * PHP 5.3
16:  *
17:  * @category  Xoops\Class\Captcha\Captcha
18:  * @package   Captcha
19:  * @author    Taiwen Jiang <phppp@users.sourceforge.net>
20:  * @copyright 2013 XOOPS Project (http://xoops.org)
21:  * @license   GNU GPL 2 or later (http://www.gnu.org/licenses/gpl-2.0.html)
22:  * @version   $Id$
23:  * @link      http://xoops.org
24:  * @since     2.6.0
25:  */
26: class XoopsCaptchaText extends XoopsCaptchaMethod
27: {
28:     /**
29:      * XoopsCaptchaText::render()
30:      *
31:      * @return string
32:      */
33:     public function render()
34:     {
35:         $form = $this->loadText() . '&nbsp;&nbsp; <input type="text" name="' . $this->config['name']
36:             . '" id="' . $this->config['name'] . '" size="' . $this->config['num_chars']
37:             . '" maxlength="' . $this->config['num_chars'] . '" value="" />';
38:         $form .= '<br />' . XoopsLocale::INPUT_RESULT_FROM_EXPRESSION;
39:         if (!empty($this->config['maxattempts'])) {
40:             $form .= '<br />' . sprintf(XoopsLocale::F_MAXIMUM_ATTEMPTS, $this->config['maxattempts']);
41:         }
42:         return $form;
43:     }
44: 
45:     /**
46:      * XoopsCaptchaText::loadText()
47:      *
48:      * @return string
49:      */
50:     public function loadText()
51:     {
52:         $val_a = mt_rand(0, 9);
53:         $val_b = mt_rand(0, 9);
54:         if ($val_a > $val_b) {
55:             $expression = "{$val_a} - {$val_b} = ?";
56:             $this->code = $val_a - $val_b;
57:         } else {
58:             $expression = "{$val_a} + {$val_b} = ?";
59:             $this->code = $val_a + $val_b;
60:         }
61:         return '<span style="font-style: normal; font-weight: bold; font-size: 100%; font-color: #333; border: 1px solid #333; padding: 1px 5px;">' . $expression . '</span>';
62:     }
63: }
64: