Question about logging the user out

+2 rezoan ahmed nazib · November 14, 2015
I have done same as shown in this tutorial. but when i go to index.php it shows me a notice that ""Notice: Undefined index: HTTP_REFERER in "". I do not have any idea how to solve this. please reply asap, when i clic login its ok and logout its works fine and the notice gone. 

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+1 Abdullah Nauman · November 15, 2015
Could you please refer to the tutorial you were watching so we could help you better?
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