当用户从问题下拉菜单中选择全部并在下面输出时,我想从下拉菜单中显示所有问题.问题是,它没有这样做,并使其变得更糟,它给了我未定义的偏移错误说明：

Notice: Undefined offset: ... in .... on line 605

605行是：

echo '<p><strong>Question:</strong> ' .htMLsPEcialchars($arrQuestionNo[$key]). ': ' .htmlspecialchars($arrQuestionContent[$key]). '</p>' . PHP_EOL;

我的问题是如果用户选择所有选项,如何修复错误并显示所有问题？

我有一个你可以通过的演示：DEMO

按照以下步骤：

>在Module下拉菜单中,选择System Stratergy并提交
>出现评估下拉菜单时,选择POKub1并提交
>您将看到学生和问题下拉菜单.你可以看到,如果你打开下拉菜单,那里有3个学生和2个问题.请选择一个学生和所有问题和ubmIT.在这里您可以看到错误,我想在此处显示所有问题的详细信息.

码：

问题下拉菜单：

<select name="question" id="questionsDrop">
<option value="0">All</option>
<option value=23">1</option>
<option value=32">1</option>
</select>

以下是根据从问题下拉菜单中选择的选项来确定显示的代码.

function Studentanswers()
        {

        $selectedstudentanswerqry = "
            SELECT
            sa.StudentId,StudentAlias,StudentForename,StudentSurname,q.SessionId,QuestionNo,QuestionContent,o.OptionType,q.Noofanswers,GROUP_CONCAT( DISTINCT Answer ORDER BY Answer SEPARATOR ',' ) AS Answer,r.ReplyType,QuestionMarks,GROUP_CONCAT(DISTINCT StudentAnswer ORDER BY StudentAnswer SEPARATOR ',') AS StudentAnswer,ResponseTime,MouseClick,StudentMark
            From Student st
            INNER JOIN Student_Answer sa ON (st.StudentId = sa.StudentId)
            INNER JOIN Student_Response sr ON (sa.StudentId = sr.StudentId)
            INNER JOIN Question q ON (sa.QuestionId = q.QuestionId)
            INNER JOIN Answer an ON q.QuestionId = an.QuestionId
            LEFT JOIN Reply r ON q.ReplyId = r.ReplyId
            LEFT JOIN Option_Table o ON q.OptionId = o.OptionId
            ";

            // Initially empty
            $where = array('q.SessionId = ?');
            $parameters = array($_POST["session"]);
            $parameterTypes = 'i';


            // Check whether a specific question was selected
            $p_question = empty($_POST["question"])?'':$_POST["question"];

            switch($p_question){
            case 0:
                //dont' add where filters
                break;
            default:
                $where[] = 'q.QuestionId = ?';
                $parameters[] .= $_POST["question"];
                $parameterTypes .= 'i';
            }

            // If we added to $where in any of the conditionals,we need a WHERE clause in
            // our query
            if(!empty($where)) {
                $selectedstudentanswerqry .= ' WHERE ' . implode(' AND ',$where);
                global $MysqLi;
                $selectedstudentanswerstmt=$MysqLi->PRepare($selectedstudentanswerqry);
                // You only need to call bind_param once

                if (count($where) == 1) {
                $selectedstudentanswerstmt->bind_param($parameterTypes,$parameters[0]);
            }
            else if (count($where) == 2) {
                $selectedstudentanswerstmt->bind_param($parameterTypes,$parameters[0],$parameters[1]);
            }


            }

            $selectedstudentanswerqry .= "
              group by sa.StudentId,q.QuestionId
              ORDER BY StudentAlias,QuestionNo
            ";

        // get result and assign VARiables (prefix with db)
        $selectedstudentanswerstmt->execute(); 
        $selectedstudentanswerstmt->bind_result($detailsStudentId,$detailsStudentAlias,$detailsStudentForename,$detailsStudentSurname,$detailsSessionId,$detailsQuestionNo,$detailsQuestionContent,$detailsOptionType,$detailsNoofAnswers,$detailsAnswer,$detailsReplyType,$detailsQuestionMarks,$detailsStudentAnswer,$detailsResponseTime,$detailsMouseClick,$detailsStudentMark);    

        $selectedstudentanswerstmt->Store_result();
        $selectedstudentanswernum = $selectedstudentanswerstmt->num_rows(); 


            $question = array();

            while ($selectedstudentanswerstmt->fetch()) {

            $arrQuestionNo = array();
            $arrQuestionContent = array();



            $arrQuestionNo[ $detailsStudentId ] = $detailsQuestionNo;
            $arrQuestionContent[ $detailsStudentId ] = $detailsQuestionContent;



            $questions[] = $arrQuestionNo;
            $questions[] = $arrQuestionContent;

        }

        $selectedstudentanswerstmt->close();

        ?>

...........................................................................................

    <h2>STUDENT'S ANSWERS</h2>

    <?PHP   

              foreach ($questions as $key=>$question) {

    echo '<p><strong>Question:</strong> ' .htmlspecialchars($arrQuestionNo[$key]). ': ' .htmlspecialchars($arrQuestionContent[$key]). '</p>' . PHP_EOL;

    }
    }
    ?>

更新：

学生表结构：

CREATE TABLE `Student` (
 `StudentId` int(10) NOT NULL AUTO_INCREMENT,`StudentForename` vArchar(25) NOT NULL,`StudentSurname` varchar(25) NOT NULL,`StudentAlias` varchar(15) NOT NULL,`StudentEmail` varchar(50) NOT NULL,`StudentUsername` varchar(20) NOT NULL,`StudentPassword` varchar(50) NOT NULL,`StudentDOB` date NOT NULL,`Year` int(2) NOT NULL,`Courseid` int(6) NOT NULL,`Active` tinyint(1) NOT NULL DEFAULT '1',Primary KEY (`StudentId`),KEY `FK_Course` (`CourseId`)
) ENginE=InnoDB AUTO_INCREMENT=41 DEFAULT CHARSET=utf8

问题表结构：

CREATE TABLE `Question` (
 `QuestionId` int(10) NOT NULL AUTO_INCREMENT,`SessionId` int(10) NOT NULL,`QuestionNo` int(3) NOT NULL,`QuestionContent` varchar(5000) NOT NULL,`NoofAnswers` int(2) NOT NULL,`ReplyId` int(1) NOT NULL,`QuestionMarks` int(4) NOT NULL,`OptionId` int(2) NOT NULL,PRIMARY KEY (`QuestionId`)
) ENGINE=InnoDB AUTO_INCREMENT=357 DEFAULT CHARSET=utf8

$question = array();

while ($selectedstudentanswerstmt->fetch()) {
    // assuming you don't need the StudentId
    $questions[] = array('no' => $detailsQuestionNo,'content' => $detailsQuestionContent);
}

foreach ($questions as $key => $question) {
    echo '<p><strong>Question:</strong> ' . 
         htmlspecialchars($question['no']) .
         ': ' . 
         htmlspecialchars($question['content']) . 
         '</p>' . 
         PHP_EOL;
}

$question = array();

while ($selectedstudentanswerstmt->fetch()) {
    if (true === isset($questions[$detailsQuestionId])) {
        $questions[$detailsQuestionId]['students'][] = $detailsStudentId;
    } else {
        $questions[$detailsQuestionId] = array();
        $questions[$detailsQuestionId]['no'] = $arrQuestionNo;
        $questions[$detailsQuestionId]['content'] = $arrQuestionContent;
        $questions[$detailsQuestionId]['students'] = array();
        $questions[$detailsQuestionId]['students'][] = $detailsStudentId;
    }
}

foreach ($questions as $questionId => $question) {
    // $question['no']
    // $question['content']

    foreach($question['students'] AS $key => $studentId) {
        // $studentId
    }
}

$students = array();

while ($selectedstudentanswerstmt->fetch()) {
    if (false === isset($students[$detailsStudentId])) {
        $students[$detailsStudentId] = array();
    }
    $students[$detailsStudentId][$detailsQuestionId] = 
                                       array('no' => $arrQuestionNo,'content' => $arrQuestionContent;
}

foreach ($students AS $studentId => $questions) {
    // $studentId
    foreach ($questions AS $questionId => $question) {
        // $questionId
        // $question['no']
        // $question['content']
    }
}