public ModuleHandlerInterface::invokeAll($hook, array $args = array())
Invokes a hook in all enabled modules that implement it.
string $hook: The name of the hook to invoke.
array $args: Arguments to pass to the hook.
array An array of return values of the hook implementations. If modules return arrays from their implementations, those are merged into one array recursively. Note: integer keys in arrays will be lost, as the merge is done using array_merge_recursive().
public function invokeAll($hook, array $args = array());
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Extension!ModuleHandlerInterface.php/function/ModuleHandlerInterface::invokeAll/8.1.x