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Just for repetition's sake, I want to do the following: I need to set custom fields and the excerpt metaboxes for WP default Posts post type when a new user is created. I know that by default WP doesn't show them but would like it to. I will be removing the Screen Options tab so the user won't be able to disable them.

I know this question has been asked for different scenarios and I have tried using and changing the code that I found here and on the web that help manipulate this but without much luck (eg: How to set default screen options?). Obviously I've tried on different installs but it doesn't work. Is there another way of doing this?

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I ended up injecting a jquery script into the header and using css to display the metaboxes. However, I will leave this open for another day or so before turning it as an answer. I still think there should be a better way to do this. – george.n Jul 16 '12 at 11:24
Is this a duplicate of How to activate “custom fields” section in WP3? – toscho Jul 28 '12 at 19:48

Based on this Answer by t31os.

Here, all meta boxes are being set to invisible, so simply remove from the array the ones that are meant to be visible.

add_action('user_register', 'wpse_58645_set_user_metaboxes');

function wpse_58645_set_user_metaboxes( $user_id ) 

For registered users, running an admin_init only once will do, but this is just the concept:

$blogusers = get_users('blog_id=1');

foreach ( $blogusers as $user ) 
    if ( !get_user_meta( $user->ID, 'metaboxhidden_post', true ) ) 
        update_user_meta( $user->ID, 'metaboxhidden_post', $meta_value );
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Anonymous down-votes without explanation should require a comment by default. Its not what you would call constructive feedback. Reeks of someone being too afraid to publicly critique another. Above all, it potentially provides a misleading indication to the validity of the answer and that's not good for anyone. – userabuser Jul 29 '12 at 12:34

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