I added the "dayOverview" dropdown list that needs to assign to the database, but when I test it, it is uneditable. How? Please check lines 51 and 164 - 176.

Download the attendance form zip file:
Inside there is the database table called attendance.sql. You need xampp and you must import the table (attendance.sql) in phpmyadmin.


# specify your table first
$mysql_db = 'attendance';
# include your db connection file
require 'connect-db.inc.php';
# if it makes it here, then the connection was successful.  Do your select * FROM $mysql_db
# AFTER the updates (see line 87) so that your page may reflect the updated information.
# this will be used to save any potential errors
// Now there is student_id hidden field in the first column.  It should correspond to the unique id 
// record on your table.
if( array_key_exists('student_id',$_POST) )
    // Notice that the name of the hidden field is "student_id[]" (with brackets at the end).  This
    // way PHP "sees" an array of student_id fields.
    foreach($_POST['student_id'] as $id)
        $id = intval($id);
        // The corresponding fields for a given row also have the student_id. So, instead of 
        // name="present", you now have name="present[X]" where X is the actual student_id for that
        // row.  If this is not clear, look at the browser's source code and you inspect one of the
        // rows.  Look at what's generated for student_id and how that field's value is 
        // "tied/related" to the other fields on that row.
        if(  array_key_exists('timeIn',$_POST) && array_key_exists('timeOut',$_POST) && array_key_exists('remarks',$_POST)  )
            if (!empty($id))
                // query to see if record exist on db
                $query = "SELECT COUNT(*) as `total` FROM `attendance` WHERE `id`=$id";
                $query_run = mysqli_query($link,$query);
                    echo 'Error ',__LINE__,': Sorry, we couldn\'t update at this time. Try again later.';
                    // retrieve the query result
                    $row = mysqli_fetch_assoc($query_run);
                    if( 0===intval($row['total']) )
                        $feedback[$id] = 'Error ' . __LINE__ . ': There is no matching record for StudentID '.$id.'.';
                    elseif( 1===intval($row['total']) )
                        $present = (int)(array_key_exists('present',$_POST) && array_key_exists($id, $_POST['present']));
                        $late    = (int)(array_key_exists('late',$_POST) && array_key_exists($id, $_POST['late']));
                        $remarks = $_POST['remarks'][$id];
                        $timeIn  = $_POST['timeIn'][$id];
                        $timeOut = $_POST['timeOut'][$id];
                        $dayOverview = $_POST['dayOverview'][$id];
                        $query = "UPDATE `attendance` SET `present`= '".$present."',`late`= '".$late."', `timeIn`= '".mysqli_real_escape_string($link,$timeIn)."', `timeOut`= '".mysqli_real_escape_string($link,$timeOut)."', `remarks`= '".mysqli_real_escape_string($link,$remarks)."', `dayOverview`= '".mysqli_real_escape_string($link,$dayOverview)."' WHERE `id`=$id LIMIT 1";
                        $query_run = mysqli_query($link,$query);
                        if ($query_run)
                            $feedback[$id] = 'StudentID ' . $id . ': Updated successfully.';
                            $feedback[$id] = 'Error ' . __LINE__ . ': Sorry, we couldn\'t update at this time. Try again later.';
                        $feedback[$id] = 'Error ' . __LINE__ . ': Unable to locate unique record.';
                $feedback[$id] = 'We couldn\'t update the attendance form at this time.';
elseif(array_key_exists('Submit',$_POST) )
    $feedback[]='You did not select any records for editing.';
# now do the query for this file
$result = mysqli_query($link, "SELECT * FROM `attendance`");
    die( 'Line '. __LINE__ . ': ' . mysqli_error($link) );
<!DOCTYPE html>
    <title>Attendance Form</title>
    <link rel="stylesheet" href="//bootswatch.com/paper/bootstrap.min.css" />
    <script type="text/javascript" src="//ajax.googleapis.com/ajax/libs/jquery/2.2.4/jquery.min.js"></script>
    <script src="http://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/js/bootstrap.min.js"></script>
    <script type="text/javascript">
    function toggleRow(id_checkbox)
        var tr = $(id_checkbox).closest("tr");
            $(this).prop("disabled", !id_checkbox.checked );
    <nav class="navbar navbar-inverse">
    <div class="container-fluid">
        <div class="navbar-header">
          <button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#bs-example-navbar-collapse-2">
            <span class="sr-only">Toggle navigation</span>
            <span class="icon-bar"></span>
            <span class="icon-bar"></span>
            <span class="icon-bar"></span>
          <a class="navbar-brand" href="index.php">Mindspace Attendance form</a>
        <div class="collapse navbar-collapse" id="bs-example-navbar-collapse-2">
            <ul class="nav navbar-nav">
                <li><a href="register.php">Register student</a></li>
                <li><a href="healthcheck.php">Healthcheck</a></li>
                <li class="dropdown">
                    <a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-expanded="false">Incident report<span class="caret"></span></a>
                    <ul class="dropdown-menu" role="menu">
                        <li><a href="incident.php">Incident report</a></li>
                        <li><a href="incident_form.php">Incident form</a></li>
    <div class="row vertical-center-row" id="form-container">
        <div class="col-md-10 col-md-offset-1" style="background:white">         
            <form id="Stu_ATT" class="form-horizontal" method="post" action="<?php echo $_SERVER['SCRIPT_NAME'];?>">
                <div>To edit a record, click on its corresponding ID checkbox.</div>
                <div class="errors"><?php if(!empty($feedback)){echo '<ul><li>',implode('</li><li>',$feedback),'</li></ul>';}?></div>
                <table class="table table-striped table-hover">
                            <th>Student name</th>
                            <th>Time in</th>
                            <th>Time out</th>
                            <th>Day Overview</th>
                    while($row = mysqli_fetch_assoc($result))
                            <td><input type="checkbox" name="student_id[]" value="<?php echo $row['id'];?>" onclick="toggleRow( this )"/><?php echo $row['id']; ?></td>
                            <td><?php echo htmlentities($row['Sname'],ENT_QUOTES,"UTF-8"); ?></td>
                            <td><input type="checkbox" class="present"              disabled="disabled" name="present[<?php echo $row['id']; ?>]" id="present"  <?php echo $row['present'] > 0 ? ' checked':'';?>></td>
                            <td><input type="checkbox" class="late"                 disabled="disabled" name="late[<?php echo $row['id']; ?>]"    id="late"     <?php echo $row['late'] > 0 ? ' checked':'';?>></td>
                            <td><input type="time"     class="timeIn  form-control" disabled="disabled" name="timeIn[<?php echo $row['id']; ?>]"  id="timeIn"   value="<?php echo $row['timeIn']; ?>"></td>
                            <td><input type="time"     class="timeOut form-control" disabled="disabled" name="timeOut[<?php echo $row['id']; ?>]" id="timeOut"  value="<?php echo $row['timeOut']; ?>"></td>
                            <td><input type="text"     class="remarks form-control" disabled="disabled" name="remarks[<?php echo $row['id']; ?>]" id="remarks"  value="<?php echo $row['remarks']; ?>"></td>
                            <td><select     class="dayOverview form-control" disabled="disabled" name="dayOverview[<?php echo $row['id']; ?>]" id="dayOverview"  value="<?php echo $row['dayOverview']; ?>">
                    <?php } ?>
                <div class="form-group">
                    <input type="submit" name="Submit" class="btn btn-primary" value="Submit">
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