php地址请求

Question

i have this request method:

if (!$_REQUEST['0'])  {
    echo "Address missing...";
    die();
} else {
    code
    code etc.
}

And address is: http://localhost/api.php?0=address

If I open: api.php?0=0 I should get another error which says address doesn't correct. But I get Address missing... In my opinion something wrong with:

if (!$_REQUEST['0']) 

Any ideas?

Answer 1

You're checking if $_REQUEST['0'] is false. In PHP (and many other languages), 0 stands for false. Because 0 == false, your expression results in 'true' and the echo and die() are executed.

If you are trying to test if $_REQUEST['0'] exists, you should use isset() or empty()