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The issue you are running into is partially an HTML issue. Forms cannot be nested. You are likely putting this inside of another form (as a great bulk of the backend is already forms). WordPress provides good handling for receiving submitted data to extend core functionality. I suggest that you look into this and figure out how to capture the data from ...


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Short answer: no. WordPress core has the basic meta box functionality (registering a box & passing a callback) - what that callback does, or how it works, is entirely up to you. You can either code your own implementation, or use a 3rd party as you mentioned.


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When working with shortcode you must return a value rather than output directly. The below amendmetn should fix your positioning issue. For more informaiont, see the Shortcode API Codex, speciffically the Output section. function multipage_form() { global $wpdb; $this_page = $_SERVER['REQUEST_URI']; $page = $_POST['page']; ...



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