Scratch

$dbHost = '***'; // localhost will be used in most cases
// set these to your mysql database username and password.
$dbUser = '***'; 
$dbPass = '***';
$dbDatabase = '****'; // the database you put the table into.
$con = mysql_connect($dbHost, $dbUser, $dbPass) or die("Failed to connect to MySQL Server. Error: " . mysql_error());

mysql_select_db($dbDatabase) or die("Failed to connect to database. Error: " . mysql_error());


$username = $_SESSION['username'];
$id = $_POST['id'];
$name = $_GET['name'];

session_start();
if ($_POST['submit']) {
mysql_query("UPDATE project_details SET reported='$username' WHERE  name='$id'", $con); //THIS PART DOESN'T WORK
echo "<p>You have reported a planet as inappropriate. That planet will remain invisible until a moderator reviews it.</p>";
} else {
echo "<form method=\"POST\" action=\"report.php\">
<p>Planet Name: <input type=\"text\" value=\"$name\" name=\"id\" readonly=\"readonly\"><br />
<input type=\"submit\" name=\"submit\" value=\"Report\"></p>
</form>";
}