Untitled

lib/connection.php
<?php
mysql_connect("localhost","root","") or die(mysql_error());
mysql_select_db("test_db") or die(mysql_error());
?>

index.php
<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Login</title>
	<link rel="stylesheet" href="css/style.css">
</head>
<?php
include 'lib/connection.php';
if (isset($_POST['login'])) {
	@$query = mysql_query("SELECT * FROM user_tb WHERE username='$_POST[username]' AND password='$_POST[password]'");
	@$cek=mysql_num_rows($query);
	if ($cek>0) {
		@$o=mysql_fetch_array($query);
		echo "Login success";
	}else{
		echo "Failed";
	}
}
?>
<body>
	<form method="post">
		<h4 align="center">Please don't let them blank</h4>
		<table align="center">
			<tr>
				<td>Username</td>
				<td>:</td>
				<td><input type="text" name="username" autofocus></td>
			</tr>
			<tr>
				<td>Password</td>
				<td>:</td>
				<td><input type="text" name="password"></td>
			</tr>
			<tr>
				<td></td>
				<td></td>
				<td><input type="submit" name="login" value="LOGIN"></td>
				<?php echo mysql_error() ?>
			</tr>
		</table>
	</form>
</body>
</html>