php - 函数结构不遵循时遇到问题(PHP)

Question

<?php


        PickModule(); // Show the thing to pick module

        if(ModuleIsSubmitted()) // When module is picked
        {
            PickSession(); // Show the thing to pick session
            if(SessionIsSubmitted()) // When session is picked
            {
              ShowAssessment(); // Show students and questions information
              if(StudentAnswersIsSubmitted()) // Student Answers button is submitted
                {
                  StudentAnswers();
                }

            }

        }



    ?>

我正在尝试遵循如下页面结构:

• PickModule() 显示

• 当用户在PickModule()函数中提交时，它会在if(ModuleIsSubmitted())中进行检查，然后在中输出检查结果>PickSession()

• PickSession() 显示

• 当用户在PickSession()函数中提交时，它会在if(SessionIsSubmitted())中进行检查，然后在中输出检查结果>ShowAssessment()

• ShowAssessment() 显示

• 当用户在 ShowAssessment() 函数中提交时，它会在 if(StudentAnswersIsSubmitted()) 中进行检查以检查是否单击了提交按钮，然后在 StudentAnswers()

中输出结果

• StudentAnswers() 显示

我遇到的问题是最后两个要点，当单击 answerSubmit 按钮并在 if(StudentAnswersIsSubmitted()) 中进行检查时，而不是在 StudentAnswers() 中显示结果，它直接返回到 PickModule() 函数。我做错了什么？

下面是它通过每个函数的代码:

下面是代码演示:DEMO

function PickModule()
{ ?>
    <form action="<?php echo htmlentities($_SERVER['PHP_SELF']); ?>" method="post"> 
        <?php            
        $moduleactive = 1;

        $sql = "SELECT ModuleId, ModuleNo, ModuleName FROM Module WHERE ModuleActive = ? ORDER BY ModuleNo"; 

        //mysqli code for modules drop down menu

        ?>
        <strong>Module:</strong>
        <select name="module" id="modulesDrop">
            <option value="">Please Select</option>
            <?php
            while($sqlstmt->fetch()) { 
                $ov = $dbModuleNo . "_" . $dbModuleName . "_" . $dbModuleId; 
                if(isset($_POST["module"]) && $ov == $_POST["module"]) 
                    echo "<option selected='selected' value='$ov'>$dbModuleNo - $dbModuleName</option>" . PHP_EOL; 
                else 
                    echo "<option value='$ov'>$dbModuleNo - $dbModuleName</option>" . PHP_EOL;
             } 
            ?>
        </select>
        <br>
        <input id="moduleSubmit" type="submit" value="Submit Module" name="moduleSubmit" />
    </form>
<?php }
function ModuleIsSubmitted()
{
    if(isset($_POST["module"]) && empty($_POST["module"])) // We picked the "Please select" option
    { ?>
            Please Select a Module
    <?php 
        return false;
    }
    else if(!isset($_POST["module"]))
    {
        return false;
    }
    else // All is ok
    {
        return true;
    }
    return false;
}
function PickSession()
{

    $dataTransfered = explode( "_" , $_POST["module"] );
    $moduleNo = $dataTransfered[0];
    $moduleName = $dataTransfered[1];
    $moduleId = $dataTransfered[2];

    //Get data from database
    $sessionquery = "
        SELECT s.SessionId, SessionName, SessionDate, SessionTime, ModuleId, SessionActive, Complete
        FROM Session s
        INNER JOIN Session_Complete sc ON sc.SessionId = s.SessionId
        WHERE
        (ModuleId = ? AND Complete = ?)
        ORDER BY SessionName 
        ";
    $complete = 1;

//mysqli code for assessments drop down menu  

    ?>

    <form action="<?php echo htmlentities($_SERVER['PHP_SELF']); ?>" method="post"> 
        <input type="hidden" name="module" value="<?php echo $_POST['module']; ?>">
        <p>
            <strong>Selected Module: </strong><?php echo $moduleNo ." - ". $moduleName; ?> 
        </p>
    <?php if ($sessionnum == 0 ){ ?>
        <div class="red">
            Sorry, You have No Assessments under this Module
        </div>
    <?php } else { ?>
           <p>
        <strong>Asessments:</strong>
        <select name="session" id="sessionsDrop">
            <option value="">Please Select</option>
            <?php
                while ( $sessionqrystmt->fetch() ) {
                    $sv = $dbSessionId;
                    if($dbSessionActive == 0){
                        $class = 'red';
                    }else{
                        $class = 'green';   
                    }
                    if(isset($_POST["session"]) && $sv == $_POST["session"]) 
                        echo "<option selected='selected' value='$sv' class='$class'>" . $dbSessionName . " - " . date('d-m-Y',strtotime($dbSessionDate)) . " - " . date('H:i',strtotime($dbSessionTime)) . "</option>" . PHP_EOL;
                    else
                        echo "<option value='$sv' class='$class'>" . $dbSessionName . " - " . date('d-m-Y',strtotime($dbSessionDate)) . " - " . date('H:i',strtotime($dbSessionTime)) . "</option>" . PHP_EOL;
                }
            ?>
        </select>
        </p>
        <input id="sessionSubmit" type="submit" value="Submit Assessments" name="sessionSubmit" />
    </form>
<?php
}
}
function SessionIsSubmitted()
{
        if(isset($_POST["session"]) && empty($_POST["session"])) // We picked the "Please select" option
        { ?>
            <div class="red">
                Please Select an Assessment
            </div>
        <?php 
            return false;
        }
    else if(!isset($_POST["session"]))
    {
        return false;
    }
    else // All is ok
    {
        return true;
    }
    return false;

}


function ShowAssessment()
{   

$studentactive = 1;

$currentstudentqry = "
SELECT
st.StudentId, st.StudentAlias, st.StudentForename, st.StudentSurname
FROM
Student_Session ss 
INNER JOIN
Student st ON ss.StudentId = st.StudentId
WHERE
(ss.SessionId = ? AND st.Active = ?)
ORDER BY st.StudentAlias
";

//mysqli code for students drop down menu


if($studentnum == 0){ ?>

<div class="red">
There are no Students who have currently taken this Assessment
</div>
<?php } else { 

$questionsqry = "
SELECT
QuestionId, QuestionNo
FROM
Question
WHERE
(SessionId = ?)
ORDER BY QuestionNo
";

//mysqli code for questions drop down menu

        ?>

<form action="<?php echo htmlentities($_SERVER['PHP_SELF']); ?>" method="post">         
<p>
<input type="text" name="session" value="<?php echo $_POST['session']; ?>">
<strong>Student:</strong>
<select name="student" id="studentsDrop">
<option value="All">All</option>
<?php
while ( $currentstudentstmt->fetch() ) {
$stu = $dbStudentId;
if(isset($_POST["student"]) && $stu == $_POST["student"]) 
    echo "<option selected='selected' value='$stu'>" . $dbStudentAlias . " - " . $dbStudentForename . " " . $dbStudentSurname . "</option>" . PHP_EOL;
else
    echo "<option value='$stu'>" . $dbStudentAlias . " - " . $dbStudentForename . " " . $dbStudentSurname . "</option>" . PHP_EOL;
}
?>
</select>
</p>

<p>
<strong>Question:</strong>
<select name="question" id="questionsDrop">
<option value="All">All</option>
<?php
while ( $questionsstmt->fetch() ) {
$ques = $dbQuestionId;
if(isset($_POST["question"]) && $ques == $_POST["question"]) 
    echo "<option selected='selected' value='$ques'>" . $dbQuestionNo . "</option>" . PHP_EOL;
else
    echo "<option value='$ques'>" . $dbQuestionNo . "</option>" . PHP_EOL;
}
?>
</select>
</p>

<input id="answerSubmit" type="submit" value="Get Student's Answers" name="answerSubmit" />
</form>

<?php
}
}

function StudentAnswersIsSubmitted()
{

if(!isset($_POST["answerSubmit"]))
    {
        return false;
    }
    else // All is ok
    {
        return true;
    }
    return false;

}

function StudentAnswers()
{

echo "student answers";

}

?>

Answer 1

我想我在这里看到了错误，在 PickSession 函数中，您在表单中有这行代码，

<input type="hidden" name="module" value="<?php echo $_POST['module']; ?>">

这会将指定的模块重新发布回脚本，您在 ShowAssessment 函数下缺少这一行，因此当用户提交“获取学生的答案”表单时，数据不会发布在表格。请注意，您还必须像我看到的那样在表单中重新发布 session 变量，但我假设您希望将其设为隐藏字段，

function ShowAssessment()
{
    //Sql...

     //Line 169 of bottom code sample
     <form action="<?php echo htmlentities($_SERVER['PHP_SELF']); ?>" method="post">         
     <p>
        <input type="hidden" name="module" value="<?php echo $_POST['module']; ?>">
        //type="hidden" not "text"    
        <input type="hidden" name="session" value="<?php echo $_POST['session']; ?>">

        //Rest of code...
}

我相信添加它会修复您的代码。请注意，您将不得不不断地重新发布所有以前提交的数据以维护代码的这种结构。