$_GET(value "0") not accepting?

Question

PHP

When receiving data $_GET (value "0") there is no response.

if ($_GET["open_items"]) 
    {
            echo $_GET["open_items"];
    }

I write file.php?open_items=0 it doesn't return anything.
I write file.php?open_items=1 it returns as it should.
We need it to return 0 when open_items=0 . Help ^^

Answer 1

if (isset($_GET["open_items"]))

Answer 2

if (!empty($_GET["open_items"])) 
{
        echo $_GET["open_items"];
}

php.net/manual/en/types.comparisons.php
"0" == 0 == false