How to verify if $_GET exists?

Question

So, I have some PHP code that looks a bit like this:

    The ID is 

    


         


        

Answer 1

Normally it is quite good to do:

echo isset($_GET['id']) ? $_GET['id'] : 'wtf';

This is so when assigning the var to other variables you can do defaults all in one breath instead of constantly using if statements to just give them a default value if they are not set.