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	if (!isset($_SERVER['PHP_AUTH_USER'])) {
		header('WWW-Authenticate: Basic realm="My Realm"');
		header('HTTP/1.0 401 Unauthorized');
		echo 'Text to send if user hits Cancel button';
		exit;
	} else {
		echo "<p>Hello {$_SERVER['PHP_AUTH_USER']}.</p>";
		echo "<p>You entered {$_SERVER['PHP_AUTH_PW']} as your password.</p>";
		exit();
	}




	$valid_passwords = array ("13131" => "1313");
	$valid_users = array_keys($valid_passwords);

	$user = $_SERVER['PHP_AUTH_USER'];
	$pass = $_SERVER['PHP_AUTH_PW'];

	$validated = (in_array($user, $valid_users)) && ($pass == $valid_passwords[$user]);

	if (!$validated) {
		header('WWW-Authenticate: Basic realm="My Realm"');
		header('HTTP/1.0 401 Unauthorized');
		die ("Not authorized");
	}

// If arrives here, is a valid user.
	echo "<p>Welcome $user.</p>";
	echo "<p>Congratulation, you are into the system.</p>";

	exit();