function hook_template_preprocess_default_variables_alter

Alter the default variables for all templates.

Allows modules to provide additional default template variables or manipulate existing. This hook is invoked from ThemeManager service's getDefaultTemplateVariables() method after basic default template variables have been set up and before the template preprocess functions are invoked.

Note that the default template variables are statically cached within a request. When adding a template variable that depends on other context, it is your responsibility to appropriately reset the default variables:

\Drupal::service('theme.manager)->resetActiveTheme()

See user_template_preprocess_default_variables_alter() for an example.

Parameters

array $variables: An associative array of default template variables, as set up by Drupal/Core/Theme/ThemeManagerInterface::getDefaultTemplateVariables(). Passed by reference.

Related topics

File

core/lib/Drupal/Core/Render/theme.api.php, line 1363

Code

function hook_template_preprocess_default_variables_alter(&$variables) {
    $variables['is_admin'] = \Drupal::currentUser()->hasPermission('access administration pages');
}