Someone

<?php

require_once("includes/connection.php");
php require_once("includes/functions.php");

$menu_name = $_POST['menu_name'];
$position = $_POST['position'];
$visible = $_POST['visible'];

$query = "INSERT INTO subjects (
          menu_name, position, visible
          ) VALUES (
          '{$menu_name}', {$position}, {$visible}
          )";

$result = mysql_query($query, $connection);
if ($result) {
 // Success!
 header('location: content.php');
 exit;
} else {
// Display error message.
 echo "<p>Subject creation failed.</p>";
 echo "<p>" . mysql_error() . "</p>";
}

mysql_close($connection); 
?>