Class 9 example files as plain text

 < ?php

session_start();

if (isset($_POST['userid']) && isset($_POST['password']))
{
	$userid = $_POST['userid'];
	$pswd = $_POST['password'];

	if ($userid == $pswd)
	{
		$_SESSION['validid'] = $userid;
	}
}

? >

 < html >
 < head >
 < title > Session example < /title >
 < /head >

 < body >

 < ?php

	if (isset($_SESSION['validid']))
	{
		echo("You are logged in as ".$_SESSION['validid']." < br / > ");
		echo(" < a href='logout.php' > log out < /a > ");
	}
	else
	{
		if (isset($userid))
		{
			echo("Could not log you in");
		}
		else
		{
			echo("You are not logged in");
		}

		// form to log in
		echo(' < form method="POST" action="index.php" > ');
		echo(' < table > ');
		echo(' < tr >  < td > name < /td > ');
		echo(' < td >  < input type="text" name="userid" >  < /td >  < /tr > ');
		echo(' < td > password < /td > ');
		echo(' < td >  < input type="password" name="password" >  < /td >  < /tr > ');
		echo(' < tr >  < td colspan="2" align="center" > ');
		echo(' < input type="submit" value="Log in" >  < /td >  < /tr > ');
		echo(' < /table >  < /form > ');
	}

? >
 < br / >
 < a href="members.php" > Members section < /a >

 < /body >
 < /html >

 < ?php

	session_start();

	echo(" < h1 > Member's section < /h1 > ");

	if (isset($_SESSION['validid']))
	{
		echo('You are logged in as '.$_SESSION['validid'].' < br/ > ');
		echo('member-only content');
	}
	else
	{
		echo('You are not logged in < br / > ');
		echo('Please register to see this page');
	}

	echo(' < a href="index.php" > Back to main < /a > ');
? >

 < ?php

session_start();

$old_user = $_SESSION['validid'];
unset($_SESSION['validid']);
session_destroy();
? >

 < html >
 < body >
 < h1 > Log out < /h1 >
 < ?php

	if (!empty($old_user))
	{
		echo('Logged out < br/ > ');
	}
	else
	{
		echo("You weren't logged in to begin with");
	}
? >

 < a href="index.php" > Back to main < /a >
 < /body >
 < /html >