Directly accessing PHP files is not really how WordPress works.
You currently have your code in a random PHP file that has no connection to WordPress. It’s probably throwing a Fatal error (Call to undefined function), which is why the next line doesn’t get executed.
You said this code is in your theme, so I would start by putting that code in functions.php. If you want it in a different file, you’ll need to add this to that functions.php file:
require_once '_options.php';
Or if it’s in a folder in your theme (like “includes”), you’d do:
require_once 'includes/_options.php';
To control when that code is fired, you would use one of the many WordPress hooks.
For the correct way you create an options page, check out this article in the codex.
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