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POWrong module is displayed in next page when using $_SESSION
 

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  1. POWrong module is displayed in next page when using $_SESSION
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    <p>Below I have a php script where it displays a "Course" drop down menu and a "Module" Drop down menu. What is suppose to happen is the user first selects a course from the "Course" drop down menu and then a list of Modules which belongs to the selected course will appear in the "Modules" drop down menu. Below is the code for this:</p> <pre><code>create_session.php $sql = "SELECT CourseId, CourseNo, CourseName FROM Course"; $sqlstmt=$mysqli-&gt;prepare($sql); $sqlstmt-&gt;execute(); $sqlstmt-&gt;bind_result($dbCourseId, $dbCourseNo, $dbCourseName); $courses = array(); // easier if you don't use generic names for data $courseHTML = ""; $courseHTML .= '&lt;select name="courses" id="coursesDrop"&gt;'.PHP_EOL; $courseHTML .= '&lt;option value=""&gt;Please Select&lt;/option&gt;'.PHP_EOL; while($sqlstmt-&gt;fetch()) { $courseno = $dbCourseNo; $course = $dbCourseId; $coursename = $dbCourseName; $courseHTML .= "&lt;option value='".$course."'&gt;" . $courseno . " - " . $coursename . "&lt;/option&gt;".PHP_EOL; } $courseHTML .= '&lt;/select&gt;'; ?&gt; &lt;form action="&lt;?php echo htmlentities($_SERVER['PHP_SELF']); ?&gt;" method="post"&gt; &lt;table&gt; &lt;tr&gt; &lt;th&gt;Course: &lt;?php echo $courseHTML; ?&gt; &lt;input id="courseSubmit" type="submit" value="Submit" name="submit" /&gt; &lt;/th&gt; &lt;/tr&gt; &lt;/table&gt; &lt;/form&gt; &lt;?php if (isset($_POST['submit'])) { $submittedCourseId = $_POST['courses']; $query = "SELECT cm.CourseId, cm.ModuleId, c.CourseNo, m.ModuleNo, c.CourseName, m.ModuleName FROM Course c INNER JOIN Course_Module cm ON c.CourseId = cm.CourseId JOIN Module m ON cm.ModuleId = m.ModuleId WHERE (c.CourseId = ?) ORDER BY c.CourseName, m.ModuleId"; $qrystmt=$mysqli-&gt;prepare($query); // You only need to call bind_param once $qrystmt-&gt;bind_param("s",$submittedCourseId); // get result and assign variables (prefix with db) $qrystmt-&gt;execute(); $qrystmt-&gt;bind_result($dbCourseId,$dbModuleId,$dbCourseNo,$dbModuleNo,$dbCourseName,$dbModuleName); $qrystmt-&gt;store_result(); $num = $qrystmt-&gt;num_rows(); if($num ==0){ echo "&lt;p style='color: red'&gt;Please Select a Course&lt;/p&gt;"; } else { $dataArray = array(); while ( $qrystmt-&gt;fetch() ) { // data array $dataArray[$dbCourseId]['CourseName'] = $dbCourseName; $dataArray[$dbCourseId]['CourseNo'] = $dbCourseNo; $dataArray[$dbCourseId]['Modules'][$dbModuleId]['ModuleName'] = $dbModuleName; $dataArray[$dbCourseId]['Modules'][$dbModuleId]['ModuleNo'] = $dbModuleNo; // session data $_SESSION['idcourse'] = $dbCourseNo; $_SESSION['namecourse'] = $dbCourseName; $_SESSION['idmodule'] = $dbModuleNo; $_SESSION['namemodule'] = $dbModuleName; } foreach ($dataArray as $foundCourse =&gt; $courseData) { $output = ""; $output .= "&lt;p&gt;&lt;strong&gt;Course:&lt;/strong&gt; " . $courseData['CourseNo'] . " - " . $courseData['CourseName'] . "&lt;/p&gt;"; $moduleHTML = ""; $moduleHTML .= '&lt;select name="module" id="modulesDrop"&gt;'.PHP_EOL; $moduleHTML .= '&lt;option value=""&gt;Please Select&lt;/option&gt;'.PHP_EOL; foreach ($courseData['Modules'] as $moduleId =&gt; $moduleData) { $moduleHTML .= "&lt;option value='$moduleId'&gt;" . $moduleData['ModuleNo'] . " - " . $moduleData['ModuleName'] ."&lt;/option&gt;".PHP_EOL; } } $moduleHTML .= '&lt;/select&gt;'; echo $output; ?&gt; &lt;form action="&lt;?php echo htmlentities($_SERVER['PHP_SELF']); ?&gt;" method="post"&gt; &lt;table&gt; &lt;tr&gt; &lt;th&gt;Course: &lt;?php echo $moduleHTML; ?&gt; &lt;input id="courseSubmit" type="submit" value="Submit" name="submit" /&gt; &lt;/th&gt; &lt;/tr&gt; &lt;/table&gt; &lt;/form&gt; </code></pre> <p>So lets say I select the Course <code>INFO101 - Information Communication Technology</code> in the "Course" drop down menu, it displays the following modules in the Module drop down menu below which corresponds with that course:</p> <pre><code>CHI2520 - Advanced Web Programming CHI2220 - Systems Strategy CHI2350 - Interactive Systems </code></pre> <p>Now this is the problem I have. If I select the module <code>CHI2520 - Advanced Web Programming</code> and then access the page below, it displays this module instead <code>CHI2350 - Interactive Systems</code>. </p> <p>QandATable.php:</p> <pre><code> &lt;?php if (isset($_POST['idmodule'])) { $_SESSION['idmodule'] = $_POST['idmodule']; } if (isset($_POST['namemodule'])) { $_SESSION['namemodule'] = $_POST['namemodule']; } if (isset($_POST['idcourse'])) { $_SESSION['idcourse'] = $_POST['idcourse']; } if (isset($_POST['namecourse'])) { $_SESSION['namecourse'] = $_POST['namecourse']; } $outputDetails = ""; $outputDetails .= " &lt;table id='sessionDetails' border='1'&gt; &lt;tr&gt; &lt;th&gt;Course:&lt;/th&gt; &lt;th&gt;{$_SESSION['idcourse']} {$_SESSION['namecourse']}&lt;/th&gt; &lt;/tr&gt; &lt;tr&gt; &lt;th&gt;Module:&lt;/th&gt; &lt;th&gt;{$_SESSION['idmodule']} {$_SESSION['namemodule']}&lt;/th&gt; &lt;/tr&gt; &lt;/table&gt; "; echo $outputDetails; ?&gt; </code></pre> <p>My question is that why does it display the wrong module number and name in the other page? Both page does include <code>session_start();</code></p> <p>Below is form which navigates to QandATable.php:</p> <pre><code>&lt;form action="QandATable.php" method="post" id="sessionForm"&gt; &lt;table&gt;&lt;tr&gt;&lt;th&gt;6: Module:&lt;/th&gt; &lt;td&gt;&lt;?php echo $moduleHTML; ?&gt;&lt;/td&gt; &lt;/tr&gt; &lt;/table&gt; &lt;p&gt;&lt;strong&gt;11: &lt;/strong&gt;&lt;input class="questionBtn" type="submit" value="Prepare Questions" name="prequestion" /&gt;&lt;/p&gt; &lt;/form&gt; </code></pre>
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    1. USuser1819709
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    1. COYou are building `$dataArray` as a 2D array, but storing values into `$_SESSION` in that fetch loop overwriting on each iteration. Do you mean to store those as an array too?
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      1. USMichael Berkowski
    2. COWhat is your code/form that posts to `QandATable.php`? You are checking `if (isset($_POST[...]))` to rest `$_SESSION[...]`, put the only code/form you show is `<form action="<?php echo htmlentities($_SERVER['PHP_SELF']); ?>" method="post">` and it only fields `<select name="courses" id="coursesDrop">` OR `<select name="module" id="modulesDrop">`
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      1. USSean
    3. CO@MichaelBerkowski Yeah that is pretty much what I am saying
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      1. USuser1819709
 

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