How to redirect to another page if it is accessed directly?

PHP
1

How to redirect a page to the homepage if it is accessed directly (Without a variable)?
Suppose we have a link “example.com/site?website=$_GET[variable]” if it is accessed like this then it is OKAY! but if someone tries to access it directly using this link “example.com/site” Then it should redirect to the Homepage.
How to do it?

2

Check if the variable is set, and if not, redirect.

if(!isset($_GET['variable'])) { header("location: /" ); exit(); }
3

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