• 12Nov

    PHP Tutorial 023: Destroying the session! (Not the world)

    PHP Tutorials

    Sometimes it is necessary to destroy a session. If you are familiar with a log in system, usually there is a “Log Out” too. Essentially, when you log in, you have a session, when you log out, that session is destroyed so others cannot latch onto the old data and leach out your personal info for their nefarious purposes. Here I demonstrate a quick and dirty not-so-realistic log in system and a way to log out. I also prove that the session is destroyed by showing a certain page’s differences when I am logged in and not.
    You need flash to play this tutorial.
    This tutorial goes over the following goals:
    How to destroy a Session, like logging out
    An example of logging in and out(fake
    since I haven’t taught how to do password
    management safely yet)
    You can find this tutorial video on youtube here.

    Here are the sources used in this tutorial:
    login.php
    <?php
//fake login php
session_start();
if((int)$_REQUEST['l']== 1){
	echo "You have been logged in, click <a href=\"tut023.php\">here</a> to go back to the main page.";
	$_SESSION['isloggedin'] = 1;
}else{
	if((int)$_SESSION['isloggedin']){
		echo "Hey, you're already logged in! click <a href=\"tut023.php\">here</a> to go back to the main page.";
	}else{
	echo "YOU FAIL!";
	}
}
?>
    logout.php
    <?php
//logout file
session_start(); 

if($_SESSION['isloggedin']){
	session_destroy();
	echo "Click <a href=\"tut023.php\">here</a> to go back to the main page!";
}else{
	echo "Click <a href=\"login.php?l=1\">here</a> to login to logout!";
} 

?>
    tut023.php
    <?php
//PHP Tutorial 023
session_start();
if($_SESSION['isloggedin']){
	echo "Yes! you are logged in! and click <a href=\"logout.php\">here</a> to logout!";
}else{
	echo "Click <a href=\"login.php?l=1\">here</a> to login";
}
print_r($_SESSION);
?>

    Here are all the php functions used in this tutorial:

    echo int print_r session_destroy session_start

    Posted by Kloplop321 @ 8:01 pm

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