How to use WordPress authentication on non-WordPress page?

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Just add this at the top of your file:

require_once($_SERVER['DOCUMENT_ROOT'].'/wp-blog-header.php');

// If you run multisite, you might nees this to prevent 404 error
header('HTTP/1.1 200 OK');

Note that the file must be in the same folder as your theme.

Then you can use is_user_logged_in before executing the rest of the script.
If use is not logged in, then just trigger the login form or a login plugin.

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