First view result as default vaue

Hello,
I'm using a view to populate the global filter and I would like to configure the global filter so that it chooses the first value as the default value.

Since I'm using a view, the first value of the view will vary through time, so I can't configure the global filter by simply selecting a default value in the "global filte defaults" section, i need to use PHP.

How can I select through PHP code the "first view's result"? I need something like

$return $view->results[0];

Thanks!