Login Error

accoun80

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Hi I'm still new and I'm building a login system, however everytime I enter the good credentials, it tells me they're bad. Can anyone help me? This is the code:
Login.php
PHP:
<?php
session_start();
require_once 'classes/Membership.php';
$membership = new Membership();

// If the user clicks the "Log Out" link on the index page.
if(isset($_GET['status']) && $_GET['status'] == 'loggedout') {
    $membership->log_User_Out();
}

// Did the user enter a password/username and click submit?
if($_POST && !empty($_POST['username']) && !empty($_POST['pwd'])) {
    $response = $membership->validate_User($_POST['username'], $_POST['pwd']);
}
                                                        

?>


<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Login Test</title>
<link rel="stylesheet" type="text/css" href="css/default.css" />
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.3.1/jquery.min.js"></script>
<script type="text/javascript" src="js/main.js"></script>
</head>

<body>
<div id="login">
    <form method="post" action="">
        <h2>Login</h2>
        <p>
            <label for="name">Username: </label>
            <input type="text" name="username" />
        </p>
        
        <p>
            <label for="pwd">Password: </label>
            <input type="password" name="pwd" />
        </p>
        
        <p>
            <input type="submit" id="submit" value="Login" name="submit" />
        </p>
    </form>
    <?php if(isset($response)) echo "<h4 class='alert'>" . $response . "</h4>"; ?>
</div><!--end login-->
</body>
</html>
Mysql.php:
PHP:
<?php

require_once 'includes/constants.php';

class Mysql {
    private $conn;
    
    function __construct() {
        $this->conn = new mysqli(DB_SERVER, DB_USER, DB_PASSWORD, DB_NAME) or 
                      die('There was a problem connecting to the database.');
    }
    
    function verify_Username_and_Pass($un, $pwd) {
                
        $query = "SELECT *
                FROM tblProjects
                WHERE Username = ? AND Password = ?
                LIMIT 1";
                
        if($stmt = $this->conn->prepare($query)) {
            $stmt->bind_param('ss', $un, $pwd);
            $stmt->execute();
            
            if($stmt->fetch()) {
                $stmt->close();
                return true;
            }
        }
        
    }
}
Membership.php:
PHP:
<?php

require 'Mysql.php';

class Membership {
    
    function validate_user($un, $pwd) {
        $mysql = New Mysql();
        $ensure_credentials = $mysql->verify_Username_and_Pass($un, $pwd);
        
        if($ensure_credentials) {
            $_SESSION['status'] = 'authorized';
            header("location: status.php");
        } else return "Please enter a correct username and password";
        
    } 
    
    function log_User_Out() {
        if(isset($_SESSION['status'])) {
            unset($_SESSION['status']);
            
            if(isset($_COOKIE[session_name()])) 
                setcookie(session_name(), '', time() - 1000);
                session_destroy();
        }
    }
    
    function confirm_Member() {
        session_start();
        if($_SESSION['status'] !='authorized') header("location: login.php");
    }
    
}
 
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