public static ImageToolkitInterface::isAvailable()
Verifies that the Image Toolkit is set up correctly.
bool TRUE if the toolkit is available on this machine, FALSE otherwise.
public static function isAvailable();
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!ImageToolkit!ImageToolkitInterface.php/function/ImageToolkitInterface::isAvailable/8.1.x