text.php

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<?php
defined('XOOPS_ROOT_PATH') or die('Restricted access');

class XoopsCaptchaText extends XoopsCaptchaMethod
{
    function render()
    {
        $form = $this->loadText() . '&nbsp;&nbsp; <input type="text" name="' . $this->config['name'] . '" id="' . $this->config['name'] . '" size="' . $this->config['num_chars'] . '" maxlength="' . $this->config['num_chars'] . '" value="" />';
        $form .= '<br />' . _CAPTCHA_RULE_TEXT;
        if (!empty($this->config['maxattempts'])) {
            $form .= '<br />' . sprintf(_CAPTCHA_MAXATTEMPTS, $this->config['maxattempts']);
        }
        return $form;
    }

    function loadText()
    {
        $val_a = rand(0, 9);
        $val_b = rand(0, 9);
        if ($val_a > $val_b) {
            $expression = "{$val_a} - {$val_b} = ?";
            $this->code = $val_a - $val_b;
        } else {
            $expression = "{$val_a} + {$val_b} = ?";
            $this->code = $val_a + $val_b;
        }
        return '<span style="font-style: normal; font-weight: bold; font-size: 100%; font-color: #333; border: 1px solid #333; padding: 1px 5px;">'.$expression.'</span>';
    }
}

?>