gistfile1.txt

/**
 * Implements hook_block_view_alter().
 */
function ex_user_block_view_masquerade_masquerade_alter(&$data, $block) {
  // Allow the block to be hidden using a conf variable.
  if (!variable_get('ex_user_show_masquerade_block', 1)) {
    $data = array();
    return;
  }

  // Change the masquerade block title and content to reflect the masquerading state.
  if (isset($_SESSION['masquerading'])) {
    $data['subject'] = t('Masquerading');
  }
}