_template_preprocess_default_variables

_template_preprocess_default_variables()

function _template_preprocess_default_variables() {
  // Variables that don't depend on a database connection.
  $variables = array(
    'attributes' => array(),
    'title_attributes' => array(),
    'content_attributes' => array(),
    'title_prefix' => array(),
    'title_suffix' => array(),
    'db_is_active' => !defined('MAINTENANCE_MODE'),
    'is_admin' => FALSE,
    'logged_in' => FALSE,
  );

  // Give modules a chance to alter the default template variables.
  \Drupal::moduleHandler()->alter('template_preprocess_default_variables', $variables);

  // Tell all templates where they are located.
  $variables['directory'] = \Drupal::theme()->getActiveTheme()->getPath();

  return $variables;
}