Completely remove WP_Admin_Bar for specific user roles

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How do I hide/remove the admin bar that is displayed when a user with specific role is logged in? I figured I have to do something with remove_menu(), but not exactly what and how.

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  1. Add the following to your functions.php file as detailed here.

    Disable Admin Bar for everyone:

    // Disable Admin Bar for everyone
if (!function_exists('disable_admin_bar')) {

    function disable_admin_bar() {

        // for the admin page
        remove_action('admin_footer', 'wp_admin_bar_render', 1000);
        // for the front-end
        remove_action('wp_footer', 'wp_admin_bar_render', 1000);

        // css override for the admin page
        function remove_admin_bar_style_backend() { 
            echo '<style>body.admin-bar #wpcontent, body.admin-bar #adminmenu { padding-top: 0px !important; }</style>';
        }     
        add_filter('admin_head','remove_admin_bar_style_backend');

        // css override for the frontend
        function remove_admin_bar_style_frontend() {
            echo '<style type="text/css" media="screen">
            html { margin-top: 0px !important; }
            * html body { margin-top: 0px !important; }
            </style>';
        }
        add_filter('wp_head','remove_admin_bar_style_frontend', 99);
    }
}
add_action('init','disable_admin_bar');

    Disable Admin Bar for everyone but administrators:

    // Disable Admin Bar for everyone but administrators
if (!function_exists('disable_admin_bar')) {

    function disable_admin_bar() {

        if (!current_user_can('manage_options')) {

            // for the admin page
            remove_action('admin_footer', 'wp_admin_bar_render', 1000);
            // for the front-end
            remove_action('wp_footer', 'wp_admin_bar_render', 1000);

            // css override for the admin page
            function remove_admin_bar_style_backend() { 
                echo '<style>body.admin-bar #wpcontent, body.admin-bar #adminmenu { padding-top: 0px !important; }</style>';
            }     
            add_filter('admin_head','remove_admin_bar_style_backend');

            // css override for the frontend
            function remove_admin_bar_style_frontend() {
                echo '<style type="text/css" media="screen">
                html { margin-top: 0px !important; }
                * html body { margin-top: 0px !important; }
                </style>';
            }
            add_filter('wp_head','remove_admin_bar_style_frontend', 99);

        }
    }
}
add_action('init','disable_admin_bar');

    Disable WP Admin Bar for specific users via user id:

    // Disable Admin Bar for specific user
if (!function_exists('disable_admin_bar')) {

    function disable_admin_bar() {

        // we're getting current user ID
        $user = get_current_user_id();

        // and removeing admin bar for user with ID 123
        if ($user == 123) {

            // for the admin page
            remove_action('admin_footer', 'wp_admin_bar_render', 1000);
            // for the front-end
            remove_action('wp_footer', 'wp_admin_bar_render', 1000);

            // css override for the admin page
            function remove_admin_bar_style_backend() { 
                echo '<style>body.admin-bar #wpcontent, body.admin-bar #adminmenu { padding-top: 0px !important; }</style>';
            }     
            add_filter('admin_head','remove_admin_bar_style_backend');

            // css override for the frontend
            function remove_admin_bar_style_frontend() {
                echo '<style type="text/css" media="screen">
                html { margin-top: 0px !important; }
                * html body { margin-top: 0px !important; }
                </style>';
            }
            add_filter('wp_head','remove_admin_bar_style_frontend', 99);

        }
    }
}
add_action('init','disable_admin_bar');

  2. Here is a 6 lines code nugget that will remove the admin bar for non contributor users : 

    add_action( 'init', 'fb_remove_admin_bar', 0 );
function fb_remove_admin_bar() {
    if (!current_user_can('edit_posts')) { // you can change the test here depending on what you want
        add_filter( 'show_admin_bar', '__return_false', PHP_INT_MAX );
    }
}

    Put that in your function.php file or in your custom plugin.

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