html head title БД title head body div h4 php if isset output echo out

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<html>
<head>
<title>БД</title>
</head>
<body>
<div>
<h4> <?php if(isset($output)) echo $output?> </h4>
<form action="index.php" align="center" method="post">
<br><br>
<input type="text" name="login" placeholder="Логин" autocomplete="on">
<br>
<input type="password" name="password" placeholder="Пароль">
<br><br><br>
<button type="submit">Войти</button>
</form>
</div>
</body>
</html>