Php 获取准备语句中的数组时出错

我在使用准备好的语句从表中获取数据时出错。是的，我对准备好的陈述是新手。有人找到解决办法了吗？还是我做错了

<?php

 session_start();

 $student_rollno = $_SESSION['student_roll'];

 require('../includes/connect.php');

 $stmnt = $conn->prepare("SELECT students.roll, students.firstname, students.lastname, students.course, students.semester FROM students,teachers WHERE students.roll = ? AND students.semester = teachers.semester ");


$stmnt->bind_param('i',$student_rollno);

if ($stmnt->execute()){
$result = $stmnt->get_result();
while ($row = $result->fetch_array(MYSQLI_ASSOC)){
    $student_roll = $row["0"];
    $student_name = $row["1"];
    $student_course = $row["2"];
    $student_semester = $row["3"];
     ?>



     <h1>Hello <?php echo $student_roll; ?>. Your details are : </h1><br><br>
        <h2>Roll No : <?php echo $student_name ?></h2>
        <h2>Course : <?php echo $student_course ?></h2>
        <h2>Semester : <?php echo $student_semester ?></h2>

<?php 
}}

 $stmnt->close();
 $conn->close();
?>

你好您的详细信息是：


卷号：
课程：
学期：

我自己刚得到解决方案。顺便说一句，谢谢你给我时间

正确的解决方案是：

        $student_roll = $row["roll"];
        $student_name = $row["firstname"];
        $student_course = $row["lastname"];
        $student_semester = $row["course"];

---

我想向你推荐一种叫做redbenaphp的替代品

如何在readbeanphp中执行相同的操作

下载rb.zip并解压缩它&您的文件是rb.php

现在，代码如下所示：

<?php

     session_start();
     include "rb.php";

     $student_rollno = $_SESSION['student_roll'];

     require('../includes/connect.php');

$result=R::getAll("SELECT students.roll, students.firstname, students.lastname, students.course, students.semester FROM students,teachers WHERE students.roll = ? AND students.semester = teachers.semester ",array($student_rollno));

foreach($result as $row){
 $student_roll = $row["students.roll"];
        $student_name = $row["students.firstname"];
        $student_course = $row["students.lastname"];
        $student_semester = $row["students.course"];
         ?>



         <h1>Hello <?php echo $student_roll; ?>. Your details are : </h1><br><br>
            <h2>Roll No : <?php echo $student_name ?></h2>
            <h2>Course : <?php echo $student_course ?></h2>
            <h2>Semester : <?php echo $student_semester ?></h2>

    <?php 
    }

?>

<?php
 R::setup( 'mysql:host=localhost;dbname=mydatabase',
        'user', 'password' ); //for both mysql or mariaDB
?>

你好您的详细信息是：


卷号：
课程：
学期：

按如下所示编辑config.php文件：

<?php

     session_start();
     include "rb.php";

     $student_rollno = $_SESSION['student_roll'];

     require('../includes/connect.php');

$result=R::getAll("SELECT students.roll, students.firstname, students.lastname, students.course, students.semester FROM students,teachers WHERE students.roll = ? AND students.semester = teachers.semester ",array($student_rollno));

foreach($result as $row){
 $student_roll = $row["students.roll"];
        $student_name = $row["students.firstname"];
        $student_course = $row["students.lastname"];
        $student_semester = $row["students.course"];
         ?>



         <h1>Hello <?php echo $student_roll; ?>. Your details are : </h1><br><br>
            <h2>Roll No : <?php echo $student_name ?></h2>
            <h2>Course : <?php echo $student_course ?></h2>
            <h2>Semester : <?php echo $student_semester ?></h2>

    <?php 
    }

?>

<?php
 R::setup( 'mysql:host=localhost;dbname=mydatabase',
        'user', 'password' ); //for both mysql or mariaDB
?>

---

当您的查询包含

students.term=teachers.term

时，您是否首先从教师表中选择

teachers.term

您的SQL查询仅从学生表中选择

you need to fetch `teachers.semester` from teachers table also.

---

在那里添加PDO异常代码，以便您可以获得准确的错误？iss

$\u会话['student\u roll']

definitiveley set？我会使用

isset

来检查，是的，我可以回应它。添加-

或死亡（$conn->errorInfo（））与您的prepare语句和check一起，我得到了这个错误。谢谢，但我认为使用这种方法将花费我更多的时间，首先理解它，然后将其应用到我的项目中。你有什么建议吗？如果你需要使用pdo，那么使用RedbeanHP将节省你很多时间