Dynamic log in / log out links

turtleton09

This is hopefully an easy one - just trying to have a link that's to log in if no-one is logged in, and log out if they are.

From a bit of a search, I realise it should be :

<?php
if(isset($_SESSION['username'])) {
    echo "Logout";
} else {
    echo "Login";
}
?>

Can anyone help me out with the syntax / code to define "Logout" and "Login"

Cheers

turtleton09

I don't know where I'm going wrong with this - if I have :

<?php
if(($_SESSION["MM_username"]))
{
echo '<a href="logout.php>">Log Out</a>';
} else {
echo '<a href="login.php">Log In</a>';
}
?>

Shouldn't that be it?

The session variable seems OK, as it outputs OK with a

<?php echo $_SESSION['MM_Username'] ?>

I'm getting the Log In link OK, but it's not switching to Log Out when I log in.

suntra

When you log out, echo $_SESSION['MM_Username'] and tell us what you get.

turtleton09

yeah - something's not right.

I think it's getting confused somewhere as I'm using Dreamweaver's login behaviours too.

I created a temp page with literally nothing but

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<title>Untitled Document</title>
</head>
<body>



<?php
	if(($_SESSION["MM_username"])) {
    echo '<a href="logout.php>">Log Out</a>';
	} else {
    echo '<a href="login.php">Log In</a>';
	}
?>

<?php echo $_SESSION['MM_Username'] ?>

</body>
</html>

That let's me log in, and

<?php echo $_SESSION['MM_Username'] ?>

correctly echoes the username.

But if I then click a link to the temp page above, the username isn't being echoed.

If I add in DW's restrict access script to the temp page, then it does echo the username.

At the moment when I go back to it after I log out, it is of course forcing me to log back in.

Think will have to look at it with a fresh head in the morning...

suntra

Well in your code, you didn't use session_start(); if you don't tell PHP to start a session, it won't echo anything when you try to print something in $_SESSION...

Also, when you log out, you have to start a session, and then use session_destroy();

turtleton09

The session is starting on the log in page - so on that one it just has to show LogIn initially. That goes to a log in page, and that's where the session starts - and the username is then echoing as it should.

I did have a typo tho :

echo '<a href="logout.php>">Log Out</a>';

But changed :

?php
	if(($_SESSION["MM_username"])) {
    echo '<a href="logout.php">Log Out</a>';
	} else {
    echo '<a href="login.php">Log In</a>';
	}
?>

<?php
if (isset($_SESSION['MM_Username'])) 
  echo '<a href="loggingout.php">Log Out</a>';
else 
  echo '<a href="login.php">Log In</a>'; 
?>

The problem I then had was with the log out script, as DW was generating the script and the line for the link around that code, ie :

and

</a>

But I couldn't figure out how to incorporate that into the if statement.

As a workaround I've created it on the logout.php page, and set it to log out when the page loads, rather than on the click of a link.

So effectively instead of

Click link > log out > goto logout.php

Its

Click link > goto logout.php > log out > goto loggedout.php

Which seems to work.

roscor

<?php session_start();
if (empty($_SESSION['MM_Username'])){
 header("location:../login.php");
} else {

//rest of code to execute

}

I use empty to establish if there is a SESSION set then redirect accordingly using the header function. It may give you alternative ideas!