WordPress SEO by Yoast: Hide Meta Boxes in Posts for Non-admins

It didn’t say in the API docs on the Yoast SEO plugin site what the ID was and I don’t have a copy of Yoast at installed at disposal, but according to yoas-plugin-dir/admin/class-metabox.php line 144, the meta_box registered is;

add_meta_box( 'wpseo_meta', ...etc ); ...

Which is hooked onto add_meta_boxes hook on line 32 of the same file,

add_action( 'add_meta_boxes', array( $this, 'add_meta_box' ) );

Of course you could get the ID from the meta box itself on the post edit screen… Anyway.

You can do the following,

add_action('add_meta_boxes', 'yoast_is_toast', 99);
function yoast_is_toast(){
    //capability of 'manage_plugins' equals admin, therefore if NOT administrator
    //hide the meta box from all other roles on the following 'post_type' 
    //such as post, page, custom_post_type, etc
    if (!current_user_can('activate_plugins')) {
        remove_meta_box('wpseo_meta', 'post_type', 'normal');
    }
}

…where post type is the post type you wish to apply this restriction too, such as post or a custom post type one or more!

Should do the trick.

_{update: manage_plugins should have been activate_plugins – ammended.}