在PHP中提交另一个表单时访问一个表单中的值 - accessing values in one form on submitting another form in PHP

我这里有两个部分，一个是类别部分，另一个是登录部分。我希望所选类别可以通过simpe $cat = $_POST['logincategory']; echo $cat;在login.php中访问，但所选的单选值是可访问的，并且在提交表单时会显示一个错误：Notice: Undefined index: logincategory

<section  id="categorysection" action="login.php"  form="loginform">

        <ul style="font-size:20px; font-color:#000;">
            <li> <input type="radio" name="logincategory" value="administrator"> Administrator </li>
            <li> <input type="radio" name="logincategory" value="director"> Director (IQAC) </li>
            <li> <input type="radio" name="logincategory" value="vicechancellor"> Vice Chancellor </li>
            <li> <input type="radio" name="logincategory" value="registrar"> Registrar </li>
            <li> <input type="radio" name="logincategory" value="facutly"> Faculty/Dept. Representative </li>
        </ul>
    <button id="logincategorybutton" type="submit" class="login-button" value="&rarr; Login" hidden>Login</button>
</section>
<section id="loginsection" >
  <form method="post" action="login.php" class="login" id="loginform">
    <p>
       <label for="username" style="color:#000; font-weight:700">Username:</label>
      <input type="text" name="username" id="username" style="width:300px" required placeholder="enter username" maxlength="20">
    </p>
    <p>
      <label for="password" style="color:#000; font-weight:700">Password:</label>
      <input type="password" name="password" id="password" style="width:300px" required placeholder="enter password" maxlength="20">
    </p>
    <p class="login-submit">
      <input type="hidden" name="form_token" value="<?php echo $form_token; ?>" />
      <button type="submit" class="login-button" onclick="document.getElementById('logincategorybutton').click();" value="&rarr; Login">Login</button>
    </p>
   <!-- <p class="forgot-password"><a href="index.html">Forgot your password?</a></p>-->
  </form>
  <sup style="color:#000; padding-left:150px;"> ** both username and password must be alpha-numeric between 4-20 characters</sup>
</section>

</body>

编辑：将单选按钮带到表单标签中，仍然面临相同的问题

<section  id="categorysection" >

        <form form="loginform">
        <ul style="font-size:20px; font-color:#000;">
            <li> <input type="radio"  name="logincategory" value="administrator"> Administrator </li>
            <li> <input type="radio"  name="logincategory" value="director"> Director (IQAC) </li>
            <li> <input type="radio"  name="logincategory" value="vicechancellor"> Vice Chancellor </li>
            <li> <input type="radio"  name="logincategory" value="registrar"> Registrar </li>
            <li> <input type="radio"  name="logincategory" value="facutly"> Faculty/Dept. Representative </li>
        </ul>
        </form>
    <button id="logincategorybutton" type="submit" class="login-button" value="&rarr; Login" hidden>Login</button>
</section>

下面是修改后的代码。

所有输入元素都需要包装在表单中。注意，我还删除了第二个提交按钮，因为每个表单只需要一个。

<form method="post" action="login.php" class="login" id="loginform">
  <section>
    <ul style="font-size:20px; font-color:#000;">
        <li> <input type="radio" name="logincategory" value="administrator"> Administrator </li>
        <li> <input type="radio" name="logincategory" value="director"> Director (IQAC) </li>
        <li> <input type="radio" name="logincategory" value="vicechancellor"> Vice Chancellor </li>
        <li> <input type="radio" name="logincategory" value="registrar"> Registrar </li>
        <li> <input type="radio" name="logincategory" value="facutly"> Faculty/Dept. Representative </li>
    </ul>
  </section>
  <section id="loginsection" >
      <p>
        <label for="username" style="color:#000; font-weight:700">Username:</label>
        <input type="text" name="username" id="username" style="width:300px" required placeholder="enter username" maxlength="20">
      </p>
      <p>
        <label for="password" style="color:#000; font-weight:700">Password:</label>
        <input type="password" name="password" id="password" style="width:300px" required placeholder="enter password" maxlength="20">
      </p>
      <p class="login-submit">
        <input type="hidden" name="form_token" value="<?php echo $form_token; ?>" />
        <button type="submit" class="login-button" onclick="document.getElementById('logincategorybutton').click();" value="&rarr; Login">Login</button>
      </p>
     <!-- <p class="forgot-password"><a href="index.html">Forgot your password?</a></p>-->
    <sup style="color:#000; padding-left:150px;"> ** both username and password must be alpha-numeric between 4-20 characters</sup>
  </section>
</form>

<section id="loginsection" >
  <form method="post" action="login.php" class="login" id="loginform">
    <p>
       <label for="username" style="color:#000; font-weight:700">Username:</label>
      <input type="text" name="username" id="username" style="width:300px" required placeholder="enter username" maxlength="20">
    </p>
    <p>
      <label for="password" style="color:#000; font-weight:700">Password:</label>
      <input type="password" name="password" id="password" style="width:300px" required placeholder="enter password" maxlength="20">
    </p>
    <p class="login-submit">
      <input type="hidden" name="form_token" value="<?php echo $form_token; ?>" />
      <button type="submit" class="login-button"  value="&rarr; Login">Login</button>
    </p>
   <!-- <p class="forgot-password"><a href="index.html">Forgot your password?</a></p>-->
  </form>
      </section>



<section  id="categorysection" >    
        <form form="loginform">
            <ul style="font-size:20px; font-color:#000;">
                <li> <input type="radio" form="loginform" name="logincategory" value="administrator"> Administrator </li>
                <li> <input type="radio" form="loginform" name="logincategory" value="director"> Director (IQAC) </li>
                <li> <input type="radio" form="loginform" name="logincategory" value="vicechancellor"> Vice Chancellor </li>
                <li> <input type="radio" form="loginform" name="logincategory" value="registrar"> Registrar </li>
                <li> <input type="radio" form="loginform" name="logincategory" value="facutly"> Faculty/Dept. Representative </li>
            </ul>
        </form>     
</section>

您需要将单选按钮放置在表单标记中。此外，您不能使用section标记提交表单。