How to hide an element after authorization?

Question

PHP

There are buttons that need to be hidden after authorization. How will the HTML code of these buttons look inside PHP in this case (if the session is empty - show, if not - hide)?

Answer 1

something like

if($_SESSION['auth'] != 1){
echo "<button>sdfsdf</button
}

I really don't know where you store the value, but after authorization, set session auth = 1

Answer 2

check some key from cookie?