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I tried to use get_page_link('page-id') and get_permalink('page-id') but the error below occurred.

Fatal error: Call to a member function get_page_permastruct() on null in ...

How can I get a page url knowing only its ID?

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  • Are you writing it like that with 'page-id'? You need to pass an actual id to it and it should work. get_permalink(4); or a variable with the id get_permalink($id); – jzatt Mar 12 '15 at 16:29
  • yes, I know. I wrote 'page-id' as an example. The problem is that it doesn't work with an existing page id. I tried it also in a fresh installation of WP. – Maverick Mar 12 '15 at 16:32
  • Good, you can never be sure so I thought I'd atleast ask! :) – jzatt Mar 13 '15 at 9:49
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You're probably getting that error because WordPress doesn't have the $wp_rewrite global loaded yet for some reason. Either something deactivated it, or you're trying to run those functions before WordPress has a chance to load it.

If you're trying to do this in a plugin or in your theme's functions.php file, make sure you're inside a function that is hooked to after_setup_theme or a hook that runs sometime after. For example:

function get_url_of_page_id_165() {
    return get_permalink( 165 );
}
add_action( 'after_setup_theme', 'get_url_of_page_id_165' );
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