How to post data from sql table - php

Question

Trying to work out on a Wordpress plugin which has to do with School Management stuff. Unfortunately to me the sellers do not reply or offer support which made me look a little into the code.
The thing I want to do is that, whenever a student is Absent or present or even late, the parent MUST read the reason behind it.
This is the teacher's attendence panel:
Teacher Panel
Now, whenever the parent wants to check his Child,this is what he sees:
Parent panel
As you can see, there's a Comment which was added by me hoping I could grab out the $comment also but with failure.
Adding the following snippet:
echo '<td>';
echo $comment;
echo '</td>';
didn't help at all.
The following one is the code:
<?php
$obj_mark = new Marks_Manage();
?>
<script>
$(document).ready(function() {
$('#student_list').DataTable({
responsive: true
});
} );
</script>
<!-- POP up code -->
<div class="popup-bg">
<div class="overlay-content">
<div class="result"></div>
<div class="view-parent"></div>
<div class="view-attendance"></div>
</div>
</div>
<?php if(isset($_REQUEST['attendance']) && $_REQUEST['attendance'] == 1)
{
?>
<div class="panel-body panel-white">
<ul class="nav nav-tabs panel_tabs" role="tablist">
<li class="active">
<a href="#child" role="tab" data-toggle="tab">
<i class="fa fa-align-justify"></i> <?php _e('Attendance', 'school-mgt'); ?></a>
</a>
</li>
</ul>
<div class="tab-content">
<div class="panel-body">
<form name="wcwm_report" action="" method="post">
<input type="hidden" name="attendance" value=1>
<input type="hidden" name="user_id" value=<?php echo $_REQUEST['student_id'];?>>
<div class="form-group col-md-3">
<label for="exam_id"><?php _e('Strat Date','school-mgt');?></label>
<input type="text" class="form-control" name="sdate" value="<?php if(isset($_REQUEST['sdate'])) echo $_REQUEST['sdate'];else echo date('Y-m-d');?>">
</div>
<div class="form-group col-md-3">
<label for="exam_id"><?php _e('End Date','school-mgt');?></label>
<input type="text" class="form-control" name="edate" value="<?php if(isset($_REQUEST['edate'])) echo $_REQUEST['edate'];else echo date('Y-m-d');?>">
</div>
<div class="form-group col-md-3 button-possition">
<label for="subject_id"> </label>
<input type="submit" name="view_attendance" Value="<?php _e('Go','school-mgt');?>" class="btn btn-info"/>
</div>
</form>
<div class="clearfix"></div>
<?php if(isset($_REQUEST['view_attendance']))
{
$start_date = $_REQUEST['sdate'];
$end_date = $_REQUEST['edate'];
$user_id = $_REQUEST['user_id'];
$comment = $_REQUEST['comment'];
$attendance = smgt_view_student_attendance($start_date,$end_date,$user_id,$comment);
$curremt_date =$start_date;
?>
<div class="table-responsive">
<table class="table col-md-12">
<tr>
<th width="200px"><?php _e('Date','school-mgt');?></th>
<th><?php _e('Day','school-mgt');?></th>
<th><?php _e('Attendance','school-mgt');?></th>
<th><?php _e('Comment', 'school-mgt');?></th>
</tr>
<?php
while ($end_date >= $curremt_date)
{
echo '<tr>';
echo '<td>';
echo $curremt_date;
echo '</td>';
$attendance_status = smgt_get_attendence($user_id,$curremt_date);
echo '<td>';
echo date("D", strtotime($curremt_date));
echo '</td>';
if(!empty($attendance_status))
{
echo '<td>';
echo smgt_get_attendence($user_id,$curremt_date);
echo '</td>';
}
else
{
echo '<td>';
echo __('Absent','school-mgt');
echo '</td>';
}
echo '<td>';
echo $comment;
echo '</td>';
echo '</tr>';
$curremt_date = strtotime("+1 day", strtotime($curremt_date));
$curremt_date = date("Y-m-d", $curremt_date);
}
?>
</table>
</div>
<?php }?>
</div>
</div>
</div>
<?php
}
else
{?>
<div class="panel-body panel-white">
<ul class="nav nav-tabs panel_tabs" role="tablist">
<li class="active">
<a href="#child" role="tab" data-toggle="tab">
<i class="fa fa-align-justify"></i> <?php _e('Child List', 'school-mgt'); ?></a>
</a>
</li>
</ul>
<div class="tab-content">
<div class="panel-body">
<form name="wcwm_report" action="" method="post">
<div class="table-responsive">
<table id="student_list" class="display dataTable" cellspacing="0" width="100%">
<thead>
<tr>
<th width="75px"><?php _e( 'Photo', 'school-mgt' ) ;?></th>
<th><?php echo _e( 'Child Name', 'school-mgt' ) ;?></th>
<th><?php _e('Roll No.','school-mgt');?></th>
<th> <?php echo _e( 'Class', 'school-mgt' ) ;?></th>
<th> <?php echo _e( 'Child Email', 'school-mgt' ) ;?></th>
<th><?php echo _e( 'Action', 'school-mgt' ) ;?></th>
</tr>
</thead>
<tfoot>
<tr>
<th><?php echo _e( 'Photo', 'school-mgt' ) ;?></th>
<th><?php echo _e( 'Child Name', 'school-mgt' ) ;?></th>
<th><?php _e('Roll No.','school-mgt');?></th>
<th> <?php echo _e( 'Class', 'school-mgt' ) ;?></th>
<th> <?php echo _e( 'Child Email', 'school-mgt' ) ;?></th>
<th><?php echo _e( 'Action', 'school-mgt' ) ;?></th>
</tr>
</tfoot>
<tbody>
<?php
if(!empty($school_obj->child_list))
{
foreach ($school_obj->child_list as $child_id){
$retrieved_data= get_userdata($child_id);
if($retrieved_data)
{
?>
<tr>
<td class="user_image text-center"><?php $uid=$retrieved_data->ID;
$umetadata=get_user_image($uid);
if(empty($umetadata['meta_value']))
//echo get_avatar($retrieved_data->ID,'46');
echo '<img src='.get_option( 'smgt_student_thumb' ).' height="50px" width="50px" class="img-circle" />';
else
echo '<img src='.$umetadata['meta_value'].' height="50px" width="50px" class="img-circle"/>';
?></td>
<td class="name"><?php echo $retrieved_data->display_name;?></td>
<td><?php echo get_user_meta($retrieved_data->ID, 'roll_id',true);?></td>
<td class="name"><?php $class_id=get_user_meta($retrieved_data->ID, 'class_name',true);
echo $classname= get_class_name($class_id);
?></td>
<td class="email"><?php echo $retrieved_data->user_email;?></td>
<td class="action">
<a href="?dashboard=user&page=student&action=result&student_id=<?php echo $retrieved_data->ID;?>" class="show-popup btn btn-default"
idtest="<?php echo $retrieved_data->ID; ?>"><i class="fa fa-bar-chart"></i> <?php _e('View Result','school-mgt');?></a>
<a href="?dashboard=user&page=student&tab=studentlist&action=showparent&student_id=<?php echo $retrieved_data->ID;?>" class="show-parent btn btn-default"
idtest="<?php echo $retrieved_data->ID; ?>"><i class="fa fa-user"></i><?php _e('View Parent','school-mgt');?> </a>
<a href="?dashboard=user&page=child&student_id=<?php echo $retrieved_data->ID;?>&attendance=1" class="btn btn-default"
idtest="<?php echo $retrieved_data->ID; ?>"><i class="fa fa-eye"></i> <?php _e('View Attendance','school-mgt');?> </a>
</td>
</tr>
<?php }
}
}
?>
</tbody>
</table>
</div>
</form>
</div>
</div>
</div>
<?php
}
?>