Getting confused with empty, isset, !empty, !isset

Question

I have the following which doesn\'t work properly as $_GET[\'category\'] can also equal 0.

if ( empty( $_GET[\'category\'] ) ){
    // do something
         


        

Answer 1

if (!isset($_GET['category']))
{
    1. Do something if $_GET['category'] does not exist at all
}
elseif ($_GET['category'] == 0)
{
    2. Do something if $_GET['category'] == 0
}
elseif (isset($_GET['category']) && ($_GET['category'] != 0)
{
    3. Do something if $_GET['category'] == something other than "does not exist" and 0.
}

My brackets might be slightly out somewhere but hopefully that should help you out.