function abc()
{
    $obDBRel = new DBRel();
    //Connecting PHP with DBMS and Obtaining Result of a query
    $conn = $obDBRel->DBConn();
    if ($conn->connect_error) {
        die("Connection failed: " . $conn->connect_error);
    }
    $sql = "SELECT Sub_Name FROM Subject";
    $result = $conn->query($sql);
    //Inserting values in dropdown
    echo "<select name='SUB'>";
    echo "<option value='subject'>Subject</option>";
    if ($result->num_rows > 0) {
        while ($row = $result->fetch_assoc()) {
            echo "<option value='" . $row['Sub_Name'] . "'>" . $row['Sub_Name'] . "</option>";
        }
    } else {
        echo "0 results";
    }
    echo "</select>";
    //Saving Resource
    $conn->close();
}
		<title>Feedback - Admin</title>
		<link rel="stylesheet" type="text/css" href="fullfec.css">
	</head>
	<body>
		<header>
                        <a href='feedback.php'><img src="../images/back.png"></a>
			<img src ="../images/tellus-logo.png"/>
			<span>
				<a href="../logout.php">Logout</a>
			</span>
		</header>
		<article>
			<h1>Complete Feedback:</h1>
			<div class=output>
					<?php 
$obDBRelb = new DBRel();
$conn = $obDBRelb->DBConn();
$sql = "Select * from feedback order by Fed_No asc";
$result = $conn->query($sql);
echo "<table class=slist>";
echo "<tr>";
echo "<th>Feedback No.</td>";
echo "<th>Roll No.</td>";
echo "<th>Subject Name</td>";
echo "<th>Feedback</td>";
echo "<th>Q1</td>";
echo "<th>Q2</td>";
echo "<th>Q3</td>";
echo "<th>Avg</td>";
echo "</tr>";
if ($result->num_rows > 0) {
<?php

session_start();
include "../bucket.php";
$obDBRel = new DBRel();
$obDBRel->redirect();
?>
<!DOCTYPE html>
	<head>
		<title>Admin Page</title>
		<link rel="stylesheet" type="text/css" href="admin.css">
	</head>
	<body>
		<header>
			<img src ="../images/tellus-logo.png"/>
			<span>
				<a href="../logout.php">Logout</a>
			</span>
		</header>
		<article>
			<h1>Admin's Utility Space:</h1>
			<div class=main>
				<div>
					<div class=lnkimg>
						<a href='addsub.php'><img src="../images/add.png"></a>
					</div>
					<div class=shorten>
						<h3>Add  Subject</h3>
						<p>Click to insert subjects to the database for adding feedback.</p>
					</div>
				</div>
<?php

error_reporting(0);
session_start();
include "../bucket.php";
$obDBRel = new DBRel();
$obDBRel->redirectlogin();
//Connecting to DB
$conn = $obDBRel->DBConn();
//Obtaining Values from Tables
$sql = "SELECT * FROM student";
$result = $conn->query($sql);
$flag = 0;
if ($_SERVER['REQUEST_METHOD'] == 'POST') {
    $_SESSION['user'] = $_POST['user'];
    $_SESSION['pass'] = $_POST['pass'];
    //Checking the entered username (admin)
    if ($_SESSION['user'] == 'admin' && $_SESSION['pass'] == 'admin') {
        header('location: ../admin/admin.php');
    }
    //Checking the entered username (student)
    while ($row = $result->fetch_assoc()) {
        if (trim($_POST['user']) == trim($row['Roll_No']) && trim(md5($_POST['pass'])) == trim($row['Pass'])) {
            $flag = 1;
        }
    }
    if ($flag == 1) {
        header('Location:../student/student.php');
    } else {
        echo "<script> alert('Wrong Username or Password!'); </script>";
    }