public ThemeHandlerInterface::hasUi($name)
Determines if a theme should be shown in the user interface.
To be shown in the UI the theme has to be installed. If the theme is hidden it will not be shown unless it is the default or admin theme.
string $name: The name of the theme to check.
bool TRUE if the theme should be shown in the UI, FALSE if not.
public function hasUi($name);
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Extension!ThemeHandlerInterface.php/function/ThemeHandlerInterface::hasUi/8.1.x