PHP简单的数学验证码功能

我正在尝试编写一个简单的数学验证码函数来验证一个表单,该表单将允许用户在博客上发布特定文章.

功能:

  function create_captcha($num1, $num2) {
        $num1 = (int)$num1;
        $num2 = (int)$num2;
        $rand_num_1 = mt_rand($num1, $num2);
        $rand_num_2 = mt_rand($num1, $num2);
        $result = $rand_num_1 + $rand_num_2;
        return $result;
    }

形成:

<h2 class="email_users_headers">Post Article</h1>
    <form action="" method="post" id="post_blog_entry">
        <input type="text" name="title" id="title" placeholder="title... *"><br>
        <textarea name="content" id="content" cols="30" rows="5" placeholder="content... *"></textarea><br>
        <?php echo create_captcha(1, 20) . ' + ' . create_captcha(1, 20) . ' = '; ?>
        <input type="text" name="captcha_results" size="2">
        <input type="hidden" name='num1' value='<?php echo create_captcha(1, 20); ?>'>
        <input type="hidden" name='num2' value='<?php echo create_captcha(1, 20); ?>'>
        <input type="submit" name="publish" value="post entry" id="publish">
    </form>

验证码验证:

if (empty($_POST['captcha_results']) === true) {
                $errors[] = 'Please enter captcha';
            } else {
                if ($_POST['captcha_results'] != $_POST['num1'] + $_POST['num2']) {
                    $errors[] = 'Incorrect captcha';
                }
            }

我知道这是完全错误的,因为无论输入结果总是不正确.有人能指出我正确的方向,因为我没有任何PHP经验.

最佳答案 每次运行create_captcha(1,20)时,它都会生成不同的值.

> create_captcha(1,20) – 3 7 = 10
> create_captcha(1,20) – 6 11 = 17

在你的表格中你称之为4次.

我想你应该这样做:

$num1 = create_captcha(1, 20);
$num2 = create_captcha(1, 20);

并在表单中使用此值:

<textarea name="content" id="content" cols="30" rows="5" placeholder="content... *"></textarea><br>
<?php echo $num1 . ' + ' . $num2 . ' = '; ?>
<input type="text" name="captcha_results" size="2">
<input type="hidden" name='num1' value='<?php echo $num1; ?>'>
<input type="hidden" name='num2' value='<?php echo $num2; ?>'>
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