How to get an array of referenced entity ids from an entity reference field

Question

I have a entity_reference field with BaseFieldDefinition::CARDINALITY_UNLIMITED cardinality. I want a list of referenced entity ids. I know that I can get all the referenced entities by calling $x->referencedEntities(), but I want only the ids to get the entities loaded later. Currently I am doing this:

  $a = [];
  foreach ($entity->autoren as $v) {
    $a[] = $v->target_id;
  }
  $this->setCurrentAnwaltReferenzen($a);

Does anyone know a better solution like it was in D7 (->raw())?

Thanks

Answer 1

As an alternative you can do it in one line with an array function instead of a loop:

$ids = array_column($entity->autoren->getValue(), 'target_id');

Edit: Use getValue() to only get the array of the field.