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How do I increase Author Role permissions to be able to add Categories?

Other solutions welcome. We just need guest authors to be able to add categories while ensuring there is not already a existing appropriate category.

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up vote 2 down vote accepted

The easiest way is to use a plugin like Capability Manager or User Role Editor

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Should work from inside your functions.php

function add_manage_cat_to_author_role() 
    if ( ! current_user_can( 'author' ) )

    // here you should check if the role already has_cap already and if so, abort/return;

    if ( current_user_can( 'author' ) ) 
        $GLOBALS['wp_roles']->add_cap( 'author','manage_categories' );
add_action( 'admin_init', 'add_manage_cat_to_author_role', 10, 0 );
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how would you check if the role has_cap already? Thanks for any pointers – Osu Mar 30 '11 at 18:48
There should be a has_cap function. I'm not really sure on how this a) can be called - do you need to access the $GLOBALS['wp_roles'] object first or is it a simple global function & b) which arguments/parameters it takes. Best would be to quickly make a cross wp-core file search (using eg. notepad++) and take a look on how it's defined. I'm pretty sure you can also access and modify the $GLOBALS['wp_roles'] object, but i wouldn't recommend doing that, because it could lead to unexpected behavior if it's needed prior to your modification. – kaiser Mar 30 '11 at 19:08
Testing this, for me it works with global $current_user; /**/ $current_user->has_cap('cap'); /**/ $current_user->add_cap('cap'); – brasofilo Mar 20 '13 at 19:44
@brasofilo Thanks for confirming – kaiser Mar 21 '13 at 1:59

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