我正在拉两个随机数来创建符号形式的数学方程。问题是在提交表单时，随机数会更新，从而使表单提交无效。如何保持加载初始数字值，以便表单将进行处理，但在成功处理后，加载新集？
操作.class
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：当页面最初加载时，会生成两个随机数（例如 10 和 15）。这呈现10 + 15 =（输入字段）
用户插入 25 并单击保存。这是正确的，但由于表单再次执行索引操作，因此有一组新的随机数使"if"条件为假。
更新：
根据 j0k 的建议，我已经对操作进行了更改。
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);
}
}
这应该有效。查看变量，看起来页面正在拉动会话变量，而不是在第二篇帖子中添加新的随机数。 奇怪。
解决
这是一个代码错误。我把变量划掉了。
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);
../
会话
是一个很好的观点。
如果未发布表单，请将结果存储在会话中，以便之后能够检查。
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);
}
}
并且不要忘记清空会话中的相关值，如果表单有效。
protected function processForm(sfWebRequest $request, $form)
{
// bind form
if ($form->isValid())
{
// clear the session
$this->getUser()->getAttributeHolder()->removeNamespace('captcha');
}
}
Ps：如果您正在寻找透明的验证码，我建议您使用此方法。我已经测试了它，取得了巨大的成功。
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保留：
session_start();
$_SESSION["num1"] = rand(0 , 20);
$_SESSION["num2"] = rand(0 , 20);