Check if value isset and null

Question

I need to check if value is defined as anything, including null. isset treats null values as undefined and returns false. Take the following as an

Answer 1

Here some silly workaround using xdebug. ;-)

function is_declared($name) {
    ob_start();
    xdebug_debug_zval($name);
    $content = ob_get_clean();

    return !empty($content);
}

$foo = null;
var_dump(is_declared('foo')); // -> true

$bla = 'bla';
var_dump(is_declared('bla')); // -> true

var_dump(is_declared('bar')); // -> false