Wordpress remove user roles

//REMOVE UNUSED ROLES 
add_action('admin_menu', 'remove_built_in_roles');
 function remove_built_in_roles() {
    global $wp_roles;
    $roles_to_remove = array('subscriber', 'contributor', 'author', 'editor');
    foreach ($roles_to_remove as $role) {
        if (isset($wp_roles->roles[$role])) {
            $wp_roles->remove_role($role);
        }
    }
}

Source: role-editor.com

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