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我有一个带有选项框的以下页面，当用户选择以下选项然后单击提交时，它会将它们带到相关的 url。但是，用户必须在与屏幕上的简单静态验证码图像匹配的框中键入正确的字符串。

目前代码看起来像这样，但是我需要帮助设置条件，以便在提交之前必须在框中输入“abcdef”，否则会出错。

<?php
// Check to see if the form has been submitted.
if(isset($_POST['menu1'])) {
  // If the form has been submitted, force a re-direct to the choice selected.
  header('Location: ' . $_POST['menu1']);
}
?>




<div style="padding-left: 50px">
<p class="arial"><strong></strong><br /><br /></p>
<form method="post"> 
<table class="freecontact2form" border="0" width="400px">
<tbody>
<tr>
<td colspan="2"><span style="font-size: x-small;"> </span> <font color=#000000 ></font>
  <br /><br /></td>
</tr>
<tr>
  <td valign="top"><table width="400px" class="freecontact2form">
    <tr>
      <td colspan="2"><br />
        <br />
        <div class="freecontact2formmessage"> </div></td>
    </tr>
    <tr>
      <td valign="top"><label for="menu1" >These are the following options:<span     class="required_star"> </span></label></td>
      <td valign="top"><select name="menu1" id="menu1">
        <option selected="selected" value ="http://www.google.com">Google </option>
        <option value ="www.msn.com">MSN</option>
        <option value ="www.youtube.com">Youtube</option>
        <option value ="bing.com">Bing</option>

      </select></td>
    </tr>

    <tr>
      <td valign="top"><label for="captcha" ><span class="required_star"></span><span     class="required_star"></span></label></td>
      <td valign="top"><BR /><BR /><img src="captcha.jpg" /></td>
    </tr>
    <tr>
      <td>Please enter the characters shown in the CAPTCHA image:</td>
      <td><input type="text" name="captcha" id="captcha" value="" size="10" />
      </td>
    </tr>
    <tr>
      <td style="text-align:center" colspan="2"><br /><br /> 
      <input type="submit" value=" Submit ">

</td>
    </tr>
  </table></td>
  <td valign="top">&nbsp;</td>
</tr>


<tr>

</tr>
<tr>

</tr>
</tbody>
</table>
</form> <br />
<p> </p>
<p> </p>
4

1 回答 1

0

首次显示页面时将代码保存在会话中。然后对照会话变量检查代码字段的 POST 值。

session_start();
$_SESSION['captcha'] = 'abcdef';

关于表单提交：

session_start();
if($_POST['captcha'] == $_SESSION['captcha'] && isset($_POST['menu1'])){
    header();
}
于 2013-03-21T12:36:16.107 回答