getting all roles

user_roles.php

<?php
function user_roles($members_only = FALSE, $permission = NULL, $full_objects = FALSE) {
  $user_roles = &backdrop_static(__FUNCTION__);

  if (!isset($user_roles)) {
    $user_roles = array();

    // @todo: Consider a cache get here instead of reading from disk.
    $names = config_get_names_with_prefix('user.role.');
    
    //....more code.