PHP Sessions?

[rory walsh <rorywalsh@xxxxxx>]

Hi everyone, I am trying to work with the idea of sessions in PHP. 
Basically I have a self-processing script called index.php but somehow I 
keep losing my session variable, it works the first time around but when 
I call it the second time around its gone? I do not reset the variable 
or destroy the session are there any other reasons why this might occur? 
The basic layout of the script is this(note this is not the full script, 
I've just posted the relevant code and left out the other stuff.)

<?php
if($_POST["username"]=="rory"){//if user logs in as rory start session
session_start();
header("Cache-control: private");
$_SESSION['loggedin'] = "yes";
}

/*It enters the first time but when I call the script again from the 
form below this one the session variable is empty?*/
if(strlen($_SESSION['loggedin'])>2){

if($_POST["verify"]=="yes"){
    die("test");
	$CONTENT .= "<font color = \"red\">Your changes have been 
made.</font><br>";
	}
        $CONTENT = "You are currently logged in as ".$_POST["username"].
"<form action=\"index.php\" method=\"POST\">
<input type=\"submit\" value=\"Log out\" />
<input type=\"hidden\" name=\"logout\" value=\"yes\"/></form>
<hr>If you would like to change the text on the main page please click here
<a href=\"index.php?page=$PAGE_TITLE&action=edit\"><font 
color=\"blue\">Edit intro page</a><font color =\"#136863\"><hr><h3>File 
Upload.</h1><hr> Any files will appear in the 'students' page of the 
website. Files that uploaded here are not availablre to the public and 
can only be acccessed by students who have logged in. Because of 
security issues only well know file types such as word, acrobat and text 
files are legible for upload.
<form enctype=\"multipart/form-data\" action=\"index.php\" method=\"POST\">
    <!-- MAX_FILE_SIZE must precede the file input field -->
    <input type=\"hidden\" name=\"MAX_FILE_SIZE\" value=\"30000\" />
    <!-- Name of input element determines name in $_FILES array -->
    Send this file: <input name=\"userfile\" type=\"file\" />
    <input type=\"submit\" value=\"Upload\" />
	<input type=\"hidden\" name=\"arg1\" value=\"yes\">
</form>";
}	
	

    if ($action == "edit")
/*when user submits this is should call teh
script again and enter the test above but it doesn't?*/
        {
		$CONTENT =
"<form method=\"post\" action=\"index.php\">
<textarea name=\"content\" cols=\"60\" rows=\"20\">$CONTENT</textarea>
<input type=\"hidden\" name=\"page\" value=\"$PAGE_TITLE\" /><br/>
<input type=\"submit\" value=\"$DONE_BUTTON\" />
<input type=\"hidden\" name=\"verify\" value=\"yes\"/></form>";
		}


Cheers,
Rory.

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