<?php
/*
Hi,
I'm new to PHP and am having trouble understanding how to use PHP
sessions. My book tells in near the beginning how to start them and register
session variables, but I can't figure out how to destroy a session or later
read those session variables. I'm also trying to do this across frames, but
can't even get it to work within a single page.
Here's what I've learned so far and what my problems are:
*/
/* To start a session */
session_start();
/* To register a session variable */
session_register("myvar");
$myvar = "some value";
/*
PROBLEM #1: From the above commands, I get a $PHPSESSID that seems to be
globally available for use, but I cannot seem to read my values back out of
the registered session variable from anywhere... I tried:
*/
print "$myvar\n"; /* and absolutely nothing is printed */
/* To destroy a session */
session_destroy();
/*
PROBLEM #2: This says there is no session to destroy. It's rather strange
because I can still print the $PHPSESSID value..
I've attached my code...
*/
?>
<?php
/*=====<< Check for New User Session >>=====*/
if(!isset($PHPSESSID))
{
session_start();
session_register("UserName");
session_register("UserPage");
$UserName = "guest";
$UserPage = "Home";
};
/*=====<< Main Switchboard for Pages >>=====*/
include "includes/bodyhead.html";
switch($action)
{
case "Home":
ShowHome();
break;
case "Login":
ShowLogin();
break;
case "AuthUser":
AuthUser($UserName, $UserPassword);
break;
case "Logout":
ShowLogout();
break;
default:
ShowMessage("Service Not Yet Implemented");
break;
}
include "includes/bodyfoot.html";
/*=====<< Function To Show Home Page >>=====*/
function ShowHome()
{
include "includes/home.html";
}
/*=====<< Function To Show Login Page >>=====*/
function ShowLogin()
{
print "<form type=put action=right.php>\n";
print "<input type=hidden name=action value=AuthUser>\n";
print "<table border=1 width=100%>\n";
print "<tr><td bgcolor=yellow align=center>USER AUTHORIZATION</td></tr>\n";
print "</table>\n";
print "<table align=center>\n";
print "<tr>\n";
print "<td><font color=yellow><b>User Name:</b></font></td>\n";
print "<td align=center><input type=text name=UserName length=16
maxlength=16></td>\n";
print "</tr>\n";
print "<tr>\n";
print "<td><font color=yellow><b>Password:</b></font></td>\n";
print "<td align=center><input type=password name=UserPassword length=16
maxlength=16></td>\n";
print "</tr>\n";
print "<tr>\n";
print "<td align=center> </td>\n";
print "<td align=center><input type=submit name=UserLogin value='USER
LOGIN'></td>\n";
print "</tr>\n";
print "</table>\n";
print "<table border=1 width=100%>\n";
print "<tr><td bgcolor=yellow align=center>UNAUTHORIZED ENTRY IS PUNISHABLE BY
LAW</td></tr>\n";
print "</table>\n";
print "</form>\n";
}
/*=====<< Function Authenticate User (from Login Page) >>=====*/
function AuthUser($User, $User)
{
if($User == "guest")
{
ShowMessage("For guest users, authorization is not required. However, priviledges
are limited.");
}
else
{
ShowMessage("Authorization Feature Not Yet Implemented");
}
}
/*=====<< Function To Logout User >>=====*/
function ShowLogout()
{
ShowMessage("Your Session Has Been Terminated.\nThank You for Properly Logging Out,
$UserName!");
session_destroy();
}
/*=====<< Function To Show Generic Messages >>=====*/
function ShowMessage($message)
{
print "<br>\n";
print "<table border=2 align=center>\n";
print "<tr><td align=center><font color=yellow>$message</font></td></tr>\n";
print "</table>\n";
}
?>
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