nascondi-barra-non-admin

//versione 1
add_filter( 'show_admin_bar' , '_function_admin_bar');
function _function_admin_bar(){
    if( !current_user_can('activate_plugins') || !current_user_can('manage_safra') ){
        return false;
    }
}

//versione 2
add_filter( 'show_admin_bar' , '_function_admin_bar');
function _function_admin_bar(){
    if( current_user_can('activate_plugins') || current_user_can('manage_safra') ){
        return true;
    }
    return false;
}