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In this lecture, you will create a session control mechanism. If the username value in the session



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has not been set,



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We will kill the page and redirect user to login page.



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To do so, we will be using session_destroy(), die() and header() functions.



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If you are new to these concepts, please learn more about PHP,  session mechanisms and specified functions



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before continuing.



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So let's start coding.



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Open your Atom Editor and create a new file, I will call it session.php and inside



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the session.php the first step, you need to start the session.



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And for the second step, we will create an if statement to check whether username value in the session



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has been set or not.



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So let's do so.



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If isset session



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username.



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So if the user name value has not been set in session, we will destroy session and redirect user to



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login page.



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And we will kill the page by using die() function, we are using it because if the attacker tries to stop



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the redirect operation because of the die() function, he won't be able to see the page.



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So it's a kind of security mechanism here.



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So let's create a new file and call it



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index.php and include our session file into it and let's check if our session control mechanism is working



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or not by going to localhost slash index.php



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As you can see, we have been redirected to login page.



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So our session control mechanism is working.



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So that is for this lecture.



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See you in the next one.