Storing data from attendance system - php

Question

I'm trying to create a students attendance system and when I'm attempting to store information to the database, I'm getting various errors about the attendance status. I'm aware this isn't a typical problem for all but it would help a beginner of PHP.
<form action="tutor_attendance.php" method="post">
<table class="table table-striped">
<tr>
<th>Student ID</th> <th>Module Name</th> <th>Attendance Status </th>
</tr>
<?php $result=mysqli_query($conn, "SELECT * FROM student");
// $serialnumber=0;
$counter=0;
while($row=mysqli_fetch_array($result))
{
?>
<tr>
<td> <?php echo $row['stud_id']; ?> </td>
<input type="hidden" value="<?php echo $row['stud_id']; ?>" name="stud_id[]" >
<td> <?php echo $row['module_1']; ?> </td>
<input type="hidden" value="<?php echo $row['module_1']; ?>" name="module_1[]">
<td>
<input type="radio" name="attendance_status[<?php echo $counter; ?>]" value="Present">Present
<input type="radio" name="attendance_status[<?php echo $counter; ?>]" value="Absent">Absent
<input type="radio" name="attendance_status[<?php echo $counter; ?>]" value="Late">Late
</td>
</tr>
<?php
$counter++;
}
?>
</table>
<input type="submit" name="submit" class="btn btn-primary " value="submit" >
</form>
The code above is the form that I'm using to present data from the database and then capture their attendance with a radio button.
if(isset($_POST['submit']))
{
foreach($_POST['attendance_status'] as $id->$attendance_status)
{
$stud_id=$_POST['stud_id'][$id];
$module_1=$_POST['module_name'][$id];
$date=date("Y-m-d H:i:s");
mysqli_query($conn, "INSERT into attedance('stud_id, module_name, attendance_status, date) VALUES('$stud_id', '$module_1','$attendance_status','$date')");
}
}
Then the code above this is once the submit button has been pressed. The errors that I'm getting are: Undefined variable: attendance_status and Creating default object from empty value. Any help would be appreciated. The errors are occurring on line 8 - foreach($_POST['attendance_status'] as $id->$attendance_status)

Answer 1

I see a few different problems but the error you are getting is due to improper foreach syntax, which should be key => value not key->value
foreach($_POST['attendance_status'] as $id => $attendance_status) {
}
The errant quote in your SQL is not causing this error, but it is certainly another error. See this line:
"INSERT into attedance('stud_id, module_name, ...
Also did you really typo your table name for attendance? My guess is that it should be:
"INSERT into attendance(stud_id, module_name, ...