public EntityType::isSubclassOf($class)
Indicates if the entity type is a subclass of the given class or interface.
string $class: The class or interface to check.
bool TRUE if the entity type is a subclass of the class or interface.
Overrides EntityTypeInterface::isSubclassOf
public function isSubclassOf($class) { return is_subclass_of($this->getClass(), $class); }
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Entity!EntityType.php/function/EntityType::isSubclassOf/8.1.x