Hide the management bar in WordPress

There are many ways to hide the management bar, and there are many reasons why you may want to hide the management bar. You can do this by adding some code in the theme's functions.php file

Disable the WordPress admin bar for all users

add_filter('show_admin_bar', '__return_false');

Disable the WordPress admin bar for specific user roles

function hide_admin_bar( $show) {
     if (current_user_can('subscriber') || current_user_can('author')):
         return false;
     endif;
     return $show;
}
add_filter('show_admin_bar','hide_admin_bar' );

Disable the WordPress admin bar for all users except administrators

function hide_admin_bar( $show) {
     if (! current_user_can('administrator')):
         return false;
     endif;
     return $show;
}
add_filter('show_admin_bar','hide_admin_bar' );