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我正在拉两个随机数以创建一个 symfony 形式的数学方程。问题是表单提交时，随机数更新，导致表单提交无效。如何保持加载初始数值，以便表单处理，但成功处理后，加载一个新集合？

动作类

 public function executeIndex(sfWebRequest $request)
  {
    $num1 = rand(0 , 20);
    $num2 = rand(0 , 20);
    $realAnswer = $num1 + $num2;

    $show = $num1 . " + " . $num2 . " = ";

    $this->getResponse()->setSlot("displayNum", $show);

    $this->form = new UserForm();

    echo $num1 . "<br>" . $num2 . "<br>" . $realAnswer;

    if ($request->isMethod('post') && ($request->getPostParameter('captcha[answer]') == $realAnswer))
    {
        $this->processForm($request, $this->form);  
    }
  }

我正在使用部分来呈现表单-> _form.php

<tr height="40">
        <td width="100" valign="middle">
            <?php echo get_slot("displayNum", "default value if slot doesn't exist"); ?>
        </td>
        <td width="400" colspan="4" valign="middle">
        <input type="text" id="captcha" class="url" name="captcha[answer]" style="width:100px" />
        </td>
    </tr>

示例：页面最初加载时，会生成两个随机数（例如 10 和 15）。这将呈现 10 + 15 =（输入字段）

用户插入 25 并点击保存。这是正确的，但是因为表单再次执行索引操作，所以有一组新的随机数使“if”条件为假。

更新：

根据 j0k 的建议，我已对操作进行了更改。

public function executeIndex(sfWebRequest $request)
    {
      $user = $this->getUser();

    if (!$request->isMethod('post'))
    {
      // first display of the form, generate nums
      $num1       = rand(0 , 20);
      $num2       = rand(0 , 20);
      $realAnswer = $num1 + $num2;

      // store them in session
      $user->setAttribute('realAnswer', $realAnswer);
      $user->setAttribute('num1', $num1);
      $user->setAttribute('num2', $num2);
    }
    else
    {
      // the form is submitted, retrieve nums from the session
      $num1       = $user->getAttribute('realAnswer', null);
      $num2       = $user->getAttribute('num1', null);
      $realAnswer = $user->getAttribute('num2', null);
    }

    //setup slot
     $show = $num1 . " + " . $num2 . " = ";
     echo $realAnswer . "-Actual<br>" . $request->getPostParameter('captcha[answer]') . "-User submitted";

    $this->form = new UserForm();

    if ($request->isMethod('post') && (($request->getPostParameter('captcha[answer]') == $realAnswer)))
    {
        $this->processForm($request, $this->form);  
    }
  }

这应该工作。查看变量，看起来页面正在拉动会话变量，而不是在第二篇文章中添加新的随机数。奇怪的。

解决

这是一个代码错误。我把变量交叉了。

else
    {
    // the form is submitted, retrieve nums from the session
     $num1       = $user->getAttribute('num1', null);
     $num2       = $user->getAttribute('num2', null);
     $realAnswer = $user->getAttribute('realAnswer', null);
../
4

2 回答 2

0

您可以将随机数存储为会话变量，这些变量将在重新加载后持续存在：

session_start();
$_SESSION["num1"] = rand(0 , 20);
$_SESSION["num2"] = rand(0 , 20);
于 2012-06-25T14:52:44.720 回答
0

会话是一个好点。

如果未发布表单，请将结果存储在会话中，以便之后进行检查。

public function executeIndex(sfWebRequest $request)
{
  $user = $this->getUser();

  if (! $request->isMethod('post'))
  {
    // first display of the form, generate nums
    $num1       = rand(0 , 20);
    $num2       = rand(0 , 20);
    $realAnswer = $num1 + $num2;

    // store them in session
    $user->setAttribute('realAnswer', $realAnswer, 'captcha');
    $user->setAttribute('num1', $num1, 'captcha');
    $user->setAttribute('num2', $num2, 'captcha');
  }
  else
  {
    // the form is submitted, retrieve nums from the session
    $num1       = $user->getAttribute('num1', null, 'captcha');
    $num2       = $user->getAttribute('num2', null, 'captcha');
    $realAnswer = $user->getAttribute('realAnswer', null, 'captcha');
  }

  $show = $num1 . " + " . $num2 . " = ";

  $this->getResponse()->setSlot("displayNum", $show);

  $this->form = new UserForm();

  if ($request->isMethod('post') && ($request->getPostParameter('captcha[answer]') == $realAnswer))
  {
    $this->processForm($request, $this->form);
  }
}

如果表单有效，不要忘记清空会话中的相关值。

protected function processForm(sfWebRequest $request, $form)
{
  // bind form

  if ($form->isValid())
  {
    // clear the session
    $this->getUser()->getAttributeHolder()->removeNamespace('captcha');
  }
}

Ps：如果你正在寻找一个透明的验证码，我推荐你这个方法。我已经对其进行了非常成功的测试。

于 2012-06-25T16:48:40.923 回答