Pega Title (formulário)

<!DOCTYPE html>
<html lang="pt-br">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/css/bootstrap.min.css" integrity="sha384-MCw98/SFnGE8fJT3GXwEOngsV7Zt27NXFoaoApmYm81iuXoPkFOJwJ8ERdknLPMO" crossorigin="anonymous">
    <title>Pegar Title</title>
</head>
<body>
    <br><br><br>
    <div class="container">
        <form name="enviarImagem" action="enviar.php" method="POST" enctype="multipart/form-data">
            <div class="form-group">
                <label>URL do Site:</label>
                <input type="text" class="form-control" name="url" required>
            </div>
            <div class="form-group">
                <input type="submit" class="btn btn-primary" value="Enviar" name="enviar">
            </div>
        </form>
    </div>
</body>
</html>