I have this code below:
while ( $qrystmt->fetch() ) {
// data array
$dataArray[$dbCourseId]['CourseName'] = $dbCourseName;
$dataArray[$dbCourseId]['Modules'][$dbModuleId]['ModuleName'] = $dbModuleName;
// session data
$_SESSION['idcourse'] = $dbCourseNo;
$_SESSION['namecourse'] = $dbCourseName;
}
Now the above code works fine when I am trying t display 2 fields in a while loop. But when I try to add a third field in the while loop, then it doesn't seem to work and it give me an error stating undefined ModuleName
.
Is the it the way I have laid it out that is causing the error in the while loop below:
while ( $qrystmt->fetch() ) {
// data array
$dataArray[$dbCourseId]['CourseName'] = $dbCourseName;
$dataArray[$dbCourseId]['Modules'][$dbModuleId]['ModuleNo'] = $dbModuleNo ['ModuleName'] = $dbModuleName;
// session data
$_SESSION['idcourse'] = $dbCourseNo;
$_SESSION['namecourse'] = $dbCourseName;
}
The full code is below where it selects a course from the database and then it selects the modules which corresponds with the course chosen:
$sql = "SELECT CourseId, CourseNo, CourseName FROM Course";
$sqlstmt=$mysqli->prepare($sql);
$sqlstmt->execute();
$sqlstmt->bind_result($dbCourseId, $dbCourseNo, $dbCourseName);
$courses = array(); // easier if you don't use generic names for data
$courseHTML = "";
$courseHTML .= '<select name="courses" id="coursesDrop">'.PHP_EOL;
$courseHTML .= '<option value="">Please Select</option>'.PHP_EOL;
while($sqlstmt->fetch())
{
$courseid = $dbCourseId;
$course = $dbCourseNo;
$coursename = $dbCourseName;
$courseHTML .= "<option value='".$courseid."'>" . $course . " - " . $coursename . "</option>".PHP_EOL;
}
$courseHTML .= '</select>';
?>
<?php
if (isset($_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->prepare($query);
// You only need to call bind_param once
$qrystmt->bind_param("s",$submittedCourseId);
// get result and assign variables (prefix with db)
$qrystmt->execute();
$qrystmt->bind_result($dbCourseId,$dbModuleId,$dbCourseNo,$dbModuleNo, $dbCourseName,$dbModuleName);
$qrystmt->store_result();
$num = $qrystmt->num_rows();
if($num ==0){
echo "<p style='color: red'>Please Select a Course</p>";
} else {
$dataArray = array();
while ( $qrystmt->fetch() ) {
// data array
$dataArray[$dbCourseId]['CourseName'] = $dbCourseName;
$dataArray[$dbCourseId]['Modules'][$dbModuleId]['ModuleName'] = $dbModuleName;
// session data
$_SESSION['idcourse'] = $dbCourseNo;
$_SESSION['namecourse'] = $dbCourseName;
}
foreach ($dataArray as $foundCourse => $courseData) {
$output = "";
$output .= "<p><strong>Course:</strong> " . $foundCourse . " - " . $courseData['CourseName'] . "</p>";
$moduleHTML = "";
$moduleHTML .= '<select name="module" id="modulesDrop">'.PHP_EOL;
$moduleHTML .= '<option value="">Please Select</option>'.PHP_EOL;
foreach ($courseData['Modules'] as $moduleId => $moduleData) {
$moduleHTML .= "<option value='$moduleId'>" . $moduleId . " - " . $moduleData['ModuleName'] ."</option>".PHP_EOL;
}
}
$moduleHTML .= '</select>';
echo $output;
...
When you call
$qrystmt->bind_result($dbCourseId,$dbModuleId,$dbCourseNo,$dbModuleNo, $dbCourseName,$dbModuleName);
You're assigning a row to $dbModuleNo. So it's probably one value and not an array. This would cause issues when you call:
$dataArray[$dbCourseId]['Modules'][$dbModuleId]['ModuleNo'] = $dbModuleNo ['ModuleName'] = $dbModuleName;
$dbModuleNo (probably) isn't defined for 'ModuleName'.
Did you try testing array with a echo of the array value before the loop? maybe you're trying to asign a value to a variable that is not well defined.
It looks like you never defined $dbModuleNo to be an array. Add $dbModuleNo = array() before your loop.
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