Javascript $\未使用Ajax更新会话

我试图更新会话playerPlan，但它没有给我更新的计划值，而是给了我1，这是预设值。我怀疑PHP没有识别我的帖子，但我的另一个PHP文件识别了我的文本输入帖子。对于我的复选框，PHP无法识别帖子，因此我不得不使用jquery。现在我有一个ajax，它只在控制台中返回会话的值，并将其更新到我的数据库中。我在localhost:XAMPP上使用这个。我现在不关心SQL注入，但我很乐意学习一个密码散列教程，就像md5教我的那样。我没有包括我的插入PHP文件

FORM: 

  <div class="container" style="margin: 50px;">
          <form action="actionSignUp.php" method="post" id="signupForm" class="signupForm">
          <h2>Signup</h2>
            <input type="hidden" name="loginActive" id="loginActive" value="0">
            <br>
        <div class="form-group row">
        <label for="username" class="col-lg-16 col-form-label">Username:</label>
        <div class="col-lg-8">
        <input type="text" class="form-control signupInput" name="username" id="username" aria-describedby="username" autocomplete="username" autofocus required>
        </div>
        <p><span class="error"><?php echo $usernameError;?></span><p>
            </div>
      <div class="form-group row">
        <label for="password" class="col-lg-16 col-form-label">Password:</label>
        <div class="col-lg-8">
        <input type="password" class="form-control signupInput" id="Password" name="password" autocomplete="current-password" required>
          </div>
          <p><span class="error"><?php echo $passwordError;?></span><p>
        </div>
        
        <h4>Account Type <i class="far fa-question-circle info" data-toggle="tooltip" data-placement="right" title="Whenever you have all free accounts checked, payment method should be hidden, but if not then click on any paid account and then click back!" height="16px"></i></h4>
        <p>Visit <a href="pricing.php">Plan</a> for pricing details.</p>
          <div class="input-group-prepend row">
              <input type="button" class="dropdown-item col-md-4 active dropdownI plan" value="Player: Free Account $0.00/Mo" class="FA" id="dfreePlayerAccount" name="fa">
              <input type="button" class="dropdown-item col-md-4 dropdownI plan" value="Player: Pro Account $5.99/Mo" class="FA" id="dproPlayerAccount" name="pa">
              <input class="dropdown-item col-md-4 dropdownI plan" value="Player: Premium Account $9.99/Mo" class="FA" id="dpremiumPlayerAccount" name="pra">
          </div>
            <br>
          <input type="radio" id="freePlayerAccount" class="free playAccount readonly" name="account" value="1" checked>
          <label for="freePlayerAccount">Player: Free Account $0.00/Mo</label><br>
          <input type="radio" id="proPlayerAccount" class="paid playAccount readonly" name="account" value="2">
          <label for="proPlayerAccount">Player: Pro Account $5.99/Mo</label><br>
          <input type="radio" id="premiumPlayerAccount" class="paid playAccount readonly" name="account" value="3">
          <label for="premiumPlayerAccount">Player: Premium Account $9.99/Mo</label><br>
          <hr>
             <h5>Optional:</h5>
             <div class="row">
              <input type="button" class="dropdown-item col-sm-6 CA" value="Creator: Pro Account $9.99/Mo" name="pca" id="dproCreatorAccount">
              <input type="button" class="dropdown-item col-sm-6 CA" value="Creator: Premium Account $14.99/Mo" id="dpremiumCreatorAccount" name="prca">
              </div>
        <br>
          <input type="radio" id="creatorProAccount" class="paid creatorAccount readonly" name="creatorAccount" value="5">
          <label for="creatorProAccount">Creator: Pro Account $9.99/Mo</label><br>
          <input type="radio" id="creatorPremiumAccount" class="paid creatorAccount readonly" name="creatorAccount" value="6">
          <label for="creatorPremiumAccount">Creator: Premium Account $14.99/Mo</label><br>
            <hr>
        <div class="hiddenPaymentMethod"> <h5>Payment Method</h5>
          <input type="radio" id="Paypal" name="payment" value="Paypal" class="payment">
          <label for="Paypal">Paypal</label><br>
          <input type="radio" id="creditCard" name="payment" value="CreditCard" class="payment">
          <label for="creditCard">Credit Card</label><br>
          <input type="text" style="display:none;" name="creditCardNumber" id="creditCardNumber" placeholder="Card Number">
          <input type="radio" id="debitCard" name="payment" value="DebitCard" class="payment">
      <label for="debitCard">Debit Card</label>
           <input type="text" style="display:none;" name="debitCardNumber" id="debitCardNumber" placeholder="Card Number"> 
            <br></div>
            <br>
        <input type="checkbox" id="termsAndConditions" class="conditions" name="termsandconditions" value="0">
        <label for="termsAndConditions"> I have read and agreed to the Terms and Conditions <span data-toggle="modal" data-target="#exampleModal"><i class="far fa-question-circle questionMark"></i></span></label>
        <p id="errors"></p>
        <p id="tacError" style="color:red"></p>
        <input type="submit" class="btn btn-primary" name="signupButton" id="signUpButton" value="Submit">
    </form>
</div>

会话更新PHP文件：

    //session_start() is already stated in the signup.php file.
    require('signup.php');
    $link = mysqli_connect("****", "****", "****", "****");
    
     
    if(mysqli_connect_error()) {
         
         die("Couldn't connect to the database. try again later.");
         
     } 
 
      $query = "SELECT * FROM `users`";

      if($result = mysqli_query($link, $query)) {
          
          $row = mysqli_fetch_array($result);
          
    }
    $_SESSION['playerPlan'] = "1";
            if(isset($_REQUEST['fa'])) {
                $_SESSION['playerPlan'] = "1";
            }
            if(isset($_REQUEST['pa'])) {
                $_SESSION['playerPlan'] = "2";
            }
            if(isset($_REQUEST['pra'])) {
                $_SESSION['playerPlan'] = "3";
            }
    
    if($_SERVER["REQUEST_METHOD"] == "POST") {
        echo $_SESSION['playerPlan'];
    } else {
        echo "no";
    }
?>

---

---

编辑：我使用的是最新版本的PHP。

您的ajax函数没有正确重新测试

您的ajax函数应该如下所示

$（文档）.ready（函数（）{
$（'signupForm'）。关于（'submit'，函数（e）{
e、 预防默认值（）；
var plan=$（'.plan'）.val（）；
var playcount=$（'input[name=“account”]：checked'）.val（）；
var key=“”；
如果（playAccount==“1”）{
key=“fa”；
计划=$（“#dfreePlayerAccount”）.val（）；
}否则如果（playAccount==“2”）{
key=“pa”；
计划=$（“#dproPlayerAccount”）.val（）；
}否则如果（playAccount==“3”）{
key=“pra”；
计划=$（“#dpremimumplayeraccount”）.val（）；
}
风险值数据={
计划：计划
};
数据[键]=计划；
$.ajax({
方法：“张贴”，
url:“ChangeUserPlan.php”，
数据：数据
}).完成（功能更新）{
控制台日志（更新）；
}).fail（函数（xhr、textStatus、errorshown）{
log（“请求时出错。请稍后再试。”）；
});
});
});

有关详细信息，请参阅。不要使用MD5存储密码打开查询、会话和post：插入

用户
（
用户名
，
密码
，
计划
）值（'bbbbbbbb'，'hebf'，'1'）1数组（[username]=>bbbbbbbbbbb[password]=>hebf[termsandconditions]=>1[fa]=>Player:免费帐户$0.00/Mo[pa]=>玩家：专业帐户$5.99/Mo[pra]=>玩家：高级帐户$9.99/Mo[pca]=>创建者：专业帐户$9.99/Mo[prca]=>创建者：高级帐户$14.99/Mo[Account]=>1[LoginActiv]=>0）我检查了值2，但它给了我帐户名的值1，因为我有检查收音机的按钮。@PalDhillon，我已经对一些部分进行了硬编码，以便您能够轻松理解。另外，为什么我要这样做ajax呢。有什么原因吗？首选项？如果您这样请求，您的post参数将是
plan:xxxfa:yyy&pa:zzz&pra:xxx
，但有一个问题，控制台显示正确的会话，但查询会插入之前的会话。我知道这可能很难理解，所以我给你举个例子。假设用户1选择高级帐户。用户1获取他之前的会话值。然后假设用户2出现并选择free，然后查询插入来自用户1的高级会话，而不是用户2的免费会话。
    //session_start() is already stated in the signup.php file.
    require('signup.php');
    $link = mysqli_connect("****", "****", "****", "****");
    
     
    if(mysqli_connect_error()) {
         
         die("Couldn't connect to the database. try again later.");
         
     } 
 
      $query = "SELECT * FROM `users`";

      if($result = mysqli_query($link, $query)) {
          
          $row = mysqli_fetch_array($result);
          
    }
    $_SESSION['playerPlan'] = "1";
            if(isset($_REQUEST['fa'])) {
                $_SESSION['playerPlan'] = "1";
            }
            if(isset($_REQUEST['pa'])) {
                $_SESSION['playerPlan'] = "2";
            }
            if(isset($_REQUEST['pra'])) {
                $_SESSION['playerPlan'] = "3";
            }
    
    if($_SERVER["REQUEST_METHOD"] == "POST") {
        echo $_SESSION['playerPlan'];
    } else {
        echo "no";
    }
?>