error500

<?php
require 'functions.php';

if( isset($_POST["login"])) {

	$username = $_POST["username"];
	$password = $_POST["password"];

	$result = mysqli_query($conn, "SELECT * FROM user WHERE username = '$username'");

	// cek username
	if( mysqli_num_rows($result) === 1) {
		header("Location : index.php");
	}

	$error = true;

}

?>
<!DOCTYPE html>
<html>
<head>
	<title>Halaman Login</title>
</head>
<body>

	<h1>Halaman Login</h1>

	<?php if( isset($error) ) : ?>
		<p style="color: red; font-style: italic;">username / password salah</p>
	<?php endif; ?>

	<form action="" method="post">

		<ul>
			<li>
				<label for="username">username :</label>
				<input type="text" name="username" id="username">
			</li>
			<li>
				<label for="password">password :</label>
				<input type="password" name="password" id="password">
			</li>
			<li>
				<button type="submit" name="login">Login</button>
			</li>
		</ul>

	</form>

</body>
</html>