PHP is submiiting blank data

[Butters]

yo!

Thanks to help from this very site, I have the following code

<?php
session_start();
if(!$_SESSION['username']) {
       //not logged in. redirect to login page
       header("Location: login.php");
       exit;
}

$p_title = $_POST['title'];
$p_menu_title = $_POST['menutitle'];
$p_summary = $_POST['summary'];
$p_body = $_POST['body'];

$address = "localhost";
$username = "mark1e_bourne";
$password = "you_wish";
$database = "mark1e_bourne";

mysql_connect($address,$username,$password);
@mysql_select_db($database) or die( "Unable to select database");

$query = "INSERT INTO news (p_title, p_menu_title, p_summary, p_body) VALUES ('$p_title','$p_menu_title','$p_summary','$p_body')";
mysql_query($query);

mysql_close();

?>

directly above my HTML form

When I click update, the information is submitted accurately, but also, another entry is made which is completely blank.

Why is this? What do I need to add to the code to stop this happening?

The part at the top:-

]<?php
session_start();
if(!$_SESSION['username']) {
       //not logged in. redirect to login page
       header("Location: login.php");
       exit;
}

is used because this is the first page presented after a successful login.

Any help, as always, greatly appreciated.

Thanks

 

[Butters]

OK, thanks guys, I'm really just being thrown in at the deepend here. My problem is I need to understand why the data is appearing, not just the code to solve it, and some of you are kind enough to point that out to me in simpler language which I am very greatful for.

Thanks again

 

[Butters]

YAY, I've done it

W00t!

thanks all again. Hopefully thats it now, dam I'm going to read up on PHP