Как можно запретить доступ к кнопке?

<?php
session_start();
include 'dbh.php';
$msg=$_POST['msg'];
$name=$_SESSION['name'];

$sql="insert into posts(msg,name) values ('$msg','$name')";

$result=mysqli_query($conn, $sql);

header("Location:home.php");	

?>

<form method="post" action="send.php">
		<textarea name="msg" placeholder="Type to send message..." class="form-control"></textarea><br>
		<input type="submit" value="Send">

	</form><br>