Php 内部联接：注意：显示未定义的索引

我有两个表

temp\u bid

和

post\u project

。我想记录谁的项目投标。为此，我使用内部联接进行了一个查询，但得到了未定义的索引错误。它在MySQL编辑器中工作

这是我的密码

<?php
include 'conn.php';
session_start();
if ($_SESSION['EmailID'] == "") {
    header("location:index.html");
}

$getTempBid = "SELECT * from temp_bid TB INNER JOIN post_project P ON P._id = TB.prj_id " + 
" WHERE TB.bidBy = '" .$_SESSION['EmailID']."'";

$tempBidResult = mysqli_query($conn,$getTempBid);

while($fetchTempBid = mysqli_fetch_row($tempBidResult)) {
    $tempBidId = $fetchTempBid['tempBidId'];
    $tempBidPrjId = $fetchTempBid['prj_id'];
    $tempBidPostBy = $fetchTempBid['postBy'];
    $tempBidBy = $fetchTempBid['bidBy'];
    $tempBidOn = new DateTime($fetchTempBid['bidOn']);
    $tempBidAmount = $fetchTempBid['amount'];
    $tempBidDays = $fetchTempBid['days'];
    $tempBidProposalDetails = $fetchTempBid['proposalDetails'];
    $tempBidStatus = $fetchTempBid['bidStatus'];
    $prjId = $fetchTempBid['_id'];
    $prjTitle = $fetchTempBid['projectTitle'];
    $prjDescriptions = $fetchTempBid['projectDescriptions'];
    $prjSkills = $fetchTempBid['projectRequiredSkill'];
    $prjSkills1 = explode(",", $prjSkills);
    $prjBudget = $fetchTempBid['projectBudget'];
    $prjPostDate = new DateTime($fetchTempBid['projectCreatedOn']);
    $prjStatus = $fetchTempBid['projectStatus'];
}
$records = mysqli_num_rows($tempBidResult);
?>

---

mysqli\u fetch\u行

返回带有数字键的数组。从：

从结果集中获取一行数据，并将其作为枚举数组返回，其中每列存储在从0（零）开始的数组偏移量中。随后对该函数的每次调用都将返回结果集中的下一行，如果没有更多行，则返回NULL

---

改为使用返回一个以列名为键的数组。

这只是意味着查询不返回任何记录。请尝试直接在mysql中使用完全相同的值

$\u SESSION['EmailID']

运行查询，并检查是否有记录出现？@AlivetoDie，我已经直接在mysql中使用完全相同的值

$\u SESSION['EmailID']

运行了相同的查询，并且有记录出现。下面是正确的答案

Notice: Undefined index: tempBidId in C:\wamp\www\Gopinath Infosystem\testpage.php on line 23
Notice: Undefined index: prj_id in C:\wamp\www\xxx\testpage.php on line 24
Notice: Undefined index: postBy in C:\wamp\www\xxx\testpage.php on line 25
Notice: Undefined index: bidBy in C:\wamp\www\xxx\testpage.php on line 26
Notice: Undefined index: bidOn in C:\wamp\www\xxx\testpage.php on line 27
Notice: Undefined index: amount in C:\wamp\www\xxx\testpage.php on line 28
Notice: Undefined index: days in C:\wamp\www\xxx\testpage.php on line 29