Untitled

<?php
include ("myConn.php");
session_start();

		if(isset($_POST['submit'])){
		$error = '';
		//username and password sent from Form, and trimmed for whitespace
		$uname = trim($_POST['username']);
		$pwd = trim($_POST['password']);

		if($uname == '')
			$error .= '<b>Username:</b> Please enter a Username<br>';

		if($pwd == '')
			$error .= '<b>Password</b> Please enter a Password<br>';

		if($error == ''){
			$query = $db->prepare('SELECT id,username,password FROM students WHERE username = :username');
			$query->bindParam(':username', $uname);
			$query->execute();
			$result = $query->fetch(PDO::FETCH_ASSOC);

			if($result === false){
				$error .= '<b>Username</b> or <b>Password</b> are not found<br>';
			} else {
				$validpwd = password_verify($pwd, $result['password']);
				if($validpwd){
						$_SESSION['user_id'] = $result['id'];
						header('location: homepage.php');
						exit;
				}
			}

			/*if($result->num_rows > 0 && password_verify($pwd, $result['password'])){
				$_SESSION['username'] = $result['username'];
				header('location: homepage.php');
				exit;
			} else {
				$error .= '<b>Username</b> or <b>Password</b> are not found<br>';
			}*/
		}
	}


?>

<!DOCTYPE html>
<html>
<head>
	<link rel="stylesheet" type="text/css" href="style.css" />
	<form action="index.php">
		<button type="submit" class="logbutton" value="back">Go Back</button>
	</form>

	<div class="logintitle">
	<h1>Login</h1>
	</div>
</head>

<br><br>
<body>
<div class= "page">
	<div class="regbox">
		<br>
<form action="" method="post">
	<label for 'username'>Username: </label>
	<input type="text" id="username" name="username" maxlength="20" placeholder="Client1" pattern="^(?=.*[A-Za-z])[A-Za-z\d]{4,}$" title="Four characters or numerics + no special characters" autofocus required />
	<br><br>
	<label for 'password'>Password: </label>
	<input type="password" id="password" name="password" maxlength="20" pattern="^(?=.*[A-Za-z])(?=.*\d)[A-Za-z\d]{6,}$" title="Contain six characters + one numeric" required />
	<br><br><br>
	<button type="submit" class="logbutton" value="submit" name="submit">Submit</button>
	<br><br>
</form>
</div>
<br><br>
<div class="errorbox">
<?php
	if(isset($error)){
		echo ''.$error.'';
	}
?>
</div>

</div>
</body>
<footer>
</footer>
</html>